I'm inclined to agree with Michael D. These two kits, in my personal opinion, are of interest mainly as relics of a remarkably dreary period in the history of the plastic model kit - and maybe as sources of spare parts.
The "Spanish Galleon" originally appeared in 1970. (The date, like all other specific information in this post, is from Dr. Thomas Graham's outstanding book, Remembering Revell Model Kits.) At that time Revell had recently gone through a big change of management and, like most other kit manufacturers, was suffering serious financial problems. The youth market was deserting the hobby, companies were going out of business (or getting bought out by toy companies) right and left, and the survivors were looking desperately for ways to draw in new consumers.
Here (slightly abridged) is the description of the kit from Dr. Graham's appendix: "A robust, twenty-five inch long model. Eagle figurehead, three masts, lower poop deck, row of shields along sides are major differences from H-397 English Man-O-War (1972). Lloyd Jones researched this model at the reference library of MGM movie studio."
The last sentence is, I think, significant and ominous. Mr. Jones was (and I imagine still is; I assume he's still with us) a deeply respected and highly knowledgable aircraft modeler and researcher. But by 1970, it seems, the artisans and researchers who had been responsible for the beautiful Revell sailing ship kits of the fifties and sixties were gone. And the idea of a movie studio as a source of information for the design of a ship model...'nuff said.
The "English Man-O-War" was initially released in 1972. Again, here's Dr. Graham's description (abridged): "Big thirty-inch model....Differences from H-400 Spanish Galleon are lion figurehead, absence of shields along sides, extra poop deck and fourth mast. This kit was designed to look like a traditional old-fashioned wooden ship model."
That last sentence, again, is pretty eloquent. I can remember reading, in my humble capacity as a part-time clerk in a local hobby shop, some of the trade literature Revell was sending to its distributors and dealers. I specifically recall a description of the "English Man-O-War" kit: "We've zeroed in on the market with this one: young married couples and interior decorators." Note the lack of reference to scale modelers - who, in 1972, apparently (and probably correctly) were assumed to comprise an insignificant percentage of Revell's clientele.
Two phrases are virtually guaranteed to make a serious scale ship modeler's eyes roll: "pirate ship" and "Spanish galleon." (I'm tempted to add another one: "tall ship." It's utterly meaningless except in the minds of marketers.) "Pirate ship," as participants in this Forum probably know, has virtually no meaning in terms of naval architecture; a vessel used for piracy almost by definition had been built for some other purpose. There really was such a thing as a "Spanish galleon" all right, but the term was used for such a long time, and has such a vague meaning, that it doesn't really mean a whole lot. More importantly, the available contemporary information about Spanish warships of the sixteenth and seventeenth centuries is extremely scanty; the truth is that we have only a vague notion of what the ships of the Armada of 1588 looked like. (We do know enough, though, to make it clear that using the same hull as the bases for models of both English and Spanish warships of the period is ridiculous.)
I don't know what Mr. Jones found in the MGM library, but the overall shape of both those hulls is, to my eye at least, pretty silly-looking. I question whether the stern structure of either of them would be capable of supporting itself. The proportions of the spars are way off. (There undoubtedly were variations, but in the usual sail plan of the late sixteenth and early seventeenth centuries each square-rigged yard was half the length of the yard below it.) The "English" kit is, if anything, even worse than the "Spanish" one. (Caveat: sometime back another Forum member mentioned that he'd converted it into an English warship of a somewhat later period. He didn't provide any pictures, as I recall, but he certainly seemed to know what he was doing and was satisfied with the results.)
On the other hand, $1.00 for those two big boxes can hardly be called a bad deal. If I remember correctly, each of the kits contained a sprue full of crew figures who were recycled from Revell's excellent 1/96 Golden Hind. The figures in Revell ship kits were, without exception, superb; I wouldn't mind paying a dollar apiece for those little guys. I don't remember what the guns looked like, but I suspect they'd be usable in other projects. If nothing else, the deck and hull parts, with their "wood grain" detail, would make distinguished contributions to a box full of parts for scratchbuilding.
Revell (the American branch of the company that is; Revell Germany's ship releases are another story that Dr. Graham doesn't cover) only released one more genuinely new sailing ship kit after these two horrors: the excellent little Viking ship, in 1977. That one, in my opinion, is one of the best sailing ship kits ever. Its details look like they were done by a completely different group of people than the ones responsible for the two kits we're discussing here. The Viking ship, according to Dr. Graham, was in the Revell catalog for only two years, and, as of the publication of his book in 2004, had not been reissued. (Fortunately it reappeared in a Revell Europe box last year, and currently can be found in hobby shops and on some websites; my advice to every plastic sailing ship enthusiast is to grab it while you can.)
I'm aware of seven Armada-period plastic ship kits that are worth building. (Actually that number is, by comparison with other periods in the history of the sailing ship, pretty high.) The Revell Golden Hind is one of my all-time favorites. The Airfix Revenge is an older kit without as much detail, but the basic shapes of it are sound (clearly based on the famous Matthew Baker Manuscript); it could quite easily form the basis of a good scale model. Moving a little, but not much, afield from 1588, both Revell versions of the Mayflower are outstanding. They feature some of the finest detail ever put into a plastic sailing ship kit. The Airfix Golden Hind and Mayflower perhaps aren't quite up to that standard, but, like almost all other Airfix sailing ship kits, they're well-designed, basically sound kits that, with work, could produce beautiful results.
The late, lamented Japanese company Imai, during its brief heyday in the late seventies and early eighties, produced several ship kits from this period. I can't claim to be personally familiar with them; at that time my personal circumstances were such that my budget couldn't handle Imai prices. But Imai never made junk [later edit: other than the Chinese variety. Sorry about that; I really didn't mean to do it. Really.]. I've read in several places that the Imai "Spanish Galleon" is just about the only kit (plastic, wood, or otherwise) floating around under that dubious name that's a reasonable, believable interpretation of a Spanish ship of the Armada era. I haven't read as much about the Imai Golden Hind, but I suspect it, like all the company's other sailing ship kits, is a good one. Imai had a knack for combining relatively simple, robust parts with overall accuracy (or at least believability); every Imai kit I've encountered has certainly been worth building, and the best of the company's products are among the best the industry has ever offered. Several of the Imai kits have reappeared recently under the Aoshima label - unfortunately at extremely high prices.
The "wood grain" detail on those Imai kits looks remarkably similar to that on the Revell Viking ship - which doesn't look much like the "wood grain" in any other Revell kit. One does have to wonder.