I use Testor's Model Master Camouflage Gray (FS 36622) for the Zeke's overall color, as well as any other IJN aircraft that're camouflaged in Gray... No it's not an exact match, not even a close one, but it looks "right" when it's compared to the "Texas Zeros" I've seen on the flightline in the CAF Tora Squadron, and in CFS II...
Texas Zeros from CAF Tora Squadron
(Man, I wish the that "Texas Raiders" had a working chin-turret sometimes... Always wondered what I'd really see if the pilot looked over his shoulder and saw the turret tracking him, lol)
CFS II A6M2:
I guess the main thing I judge by is the contrast between the camouflage color and the "meatballs"... When it gets to the "green side" of the grey shade some folks are using it causes the meatball to "vibrate"... Whether or not the color is "right" is irrelevant to me in the case of IJN birds, but more about what I think looks right, taking into account scale color and lighting, since they're always on dioramas or in shadow-boxes with controled lighting....
Note the variations on color of the top Zekes vs the bottom one (as seen through the Fort's nose) as the angle of the sun changes... With the sun lower in the eastern sky in the bottom photo, the color takes on a slightly darker look, while at mid-day, it's a "brighter" gray.. The CFS II screenshot is there becasue I painted that particular model "skin", same as I did the SBD's skin..
As for if it's "worth building", well... I'd have to say that almost every kit I buy is worth building, with damned-few exceptions (The Aurora P-61 being one of those, Scratch-building an entire 1/48 P-61 would be faster than fixing what all's wrong with that one...). For the level of detail and ease of assembly, as well as price, the Tamiya A6M2 is pretty hard to beat... It's a "shake & bake", true, but it's also a great kit for a beginner to build S.O.B., and intermediate and advanced modelers can easily to go to town on it with scratch-built details...
I think I paid like 16.00 for it last time I bought it at Hobby Lobby... Still need the Rufe and Hamp, though (Anyone besides Tamiya even make those two in 1/48th?)... I've also got their recent A6M5, but that one isn't in the line-up yet, and haven't seen a copy of the Hamp anywhere off-line, although my LHS guy can get one for me whenever I ask him to...
Meanwhile, I've gotten the A6M5 from Monogram up on the bench, at about 65%, plus another to start, and four other injection-molded Jap fighters sitting there, all Otaki kits, Frank, Oscar, and Jack, and an Arii Tony... Add the 1/48 Jill and Grace vac-forms, and one each a 1/32 scale Revell Zeke and Tony, I'm sitting pretty with "Aircraft of the Rising Sun"... I think that's more aircraft than the IJN and Army had after the Marianas Turkey Shoot...
Still looking for that ever-elusive 1/32 Revell Jack though... THAT aircraft has turned into my "Elenore"... Every time it pops up on Ebay, it starts at 22.00 or so, and before it's over, it's upwards of 130.00...
But yeah.. The Tammy-zeke..It's worth it... Especially at the price they want for it... How can you go wrong with a Tamiya kit for 16-20.00?