I have the impression that Trumpeter is in fact sort of a consortium, with kits in different genres and scales coming from different sources. I'm also unclear on what relationship exists between Trumpeter and a couple of other Chinese firms, Hobbyboss and Pit Road. Maybe somebody can fill us in on that.
The only Trumpeter kits with which I'm really familiar are some of the 1/700 ships. As I understand it (maybe somebody can correct me), that series comes from the same folks who used to be responsible for the Skywave/Pit Road series in that scale. In my opinion the Trumpeter 1/700 North Carolina and Washington can easily stand comparison with any other 1/700 styrene kit, in terms of detail, fit, and virtually any other characteristic. (The only problem I've found so far with the one I'm working on is that one pair of 5" gunmounts is out of place by a few millimeters.) Many modelers, including me, sing the praises of the Tamiya 1/700 Iowa-class battleships, but I can't see any clear superiority. (Tamiya trumpeted [sorry] the fact that its Missouri has countersunk lines between the deck planks. So do the Trumpeter North Carolina and Washington.) I also have the 1/700 Saratoga in my "to do" stack; it certainly appears to fit in the same category.
I find it interesting that, in addition to filling in some big gaps in the available subjects (e.g., up-to-date renditions of South Dakota-class battleships, French battleships, and American cruisers), Trumpeter is now taking on the "big boys" directly. Tamiya's 1/700 Prinz Eugen is an excellent, up-to-date kit (I don't remember exactly when it was released, but it wasn't long ago). Trumpeter has just announced one that will compete head-to-head with it. And now we have 1/700 versions of H.M.S. Repulse from both companies - both in 1941 configuration. The comparison should be interesting.
Trumpeter's 1/350 warships have a mixed reputation, but generally seem to have been getting better as time goes by. I've only bought one of them: the Fletcher-class destroyer. It got pretty thoroughly savaged by web commentators; I personally don't think it's as bad as some people do, but it certainly isn't up to the standard of the Tamiya competition. On the other hand, there seems to be general agreement that the Trumpeter 1/350 Buckley-class destroyer escort is a first-rate kit. And the 1/350 kits released over the past few months seem to have been getting uniformly good reviews.
It looks to me like Trumpeter dived into the plastic scale model industry with both feet, determined to churn out a staggering number of releases in record time. (It would be difficult to get an accurate count, but I suspect the number of new aircraft, ship, and armor kits released by Trumpeter in the past, say, five years far exceeds the number released by Revell or Monogram - or virtually any other company - in any five-year period in its history.) I'm not competent to pass judgment on whether that was a sound business decision, but it's probably inevitable that in such an ambitious release program there will be a certain number of duds.
As for prices - well, 1/350 warship kits in general, except for destroyer types, are frankly beyond my budget these days. I might - might - be able to justify spending $100 on a kit that (a) I knew I was going to build right away and (b) would keep me busy for three or four months. But not for one that would go in the stash and, if I ever got it out, would be finished within a few weeks. Hasegawa's 1/350 Akagi is, I'm sure, an outstanding kit. But the kit itself and the associated photo-etched sheets that Hasegawa sells to go with it would cost upwards of $500. I just can't handle that. The Trumpeter 1/700 warships, on the other hand, seem to be priced about like most of the competition, if not a bit lower. (For example, Squadron sells the Tamiya 1/700 Missouri for $38.70 and the Trumpeter 1/700 North Carolina for $29.66.) And Trumpeter 1/700 ship kits certainly are cheaper than most (albeit not all) comparable resin kits.
I can't comment on Trumpeter aircraft or armor kits from personal experience. But I have to say I do think the company is making a significant positive contribution to the plastic warship kit market - especially in 1/700 scale.