People
still associate those movies with the franchise fatigue they had at the time.
To be sure, a lot of the fatigue was earned. While Voyager and Enterprise continued to produce many good episodes, particularly Enterprise, they simply were staying static, and needed to change and expand.
Before Enterprise I argued they just needed to shake up the franchise and install new producers and writers, and change the look. They produced over 500 episodes with most of the same "team" in place. Then another whole series. There were a lot of talented people there, but any group with the same ideas eventually winds up seeming repetitive and tired. In the movies, new directors and writers attempted to change that, but even change has to be carefully managed, and Stuart Baird and John Logan just couldn't take it to the heights required. Maybe it was Berman's fault.
As far as the actual movies go: Generations looks pretty decent. It has several immensely entertaining scenes and moments..but simply fails as a story. It's too convoluted and to my estimation, has the most and biggest plot holes of any Trek movie. It has a smaller budget than STV...which kind of shows despite some good cinematography that attempts to counteract this. I rank it as one of only 2
"bad" Trek movies, though it's several
million times better than
STV.
STFC is very good, but possibly only the 7th or 8th best Borg story. It could have been much better. The battle at the beginning was the setup of most of the first few Tv episodes! It was short and underwhelming and framed like a TV show. The 21st century scenes could have been a bit tighter. Still I only rank STII higher from the TOS movies.
ST:INS is a quandary. In the theaters I was underwhelmed by it. I believe it has a worthwhile message but that alone doesn't make it great. It's without a doubt a "TV" episode though the location shots are just beautiful to watch. The set design is disappointing. If I'm in the mood, it's not a bad diversion.
Nemesis: Possibly the most "controversial" Trek movie. Not in it's themes but because people differ in opinions over it almost as much as the Kelvin universe. I rank it 7th, just below STIV. Middle-of-the-pack. It looks like the most expensive of the first 10 and it is. Pacing might be the biggest problem in this one. Editing would have helped immensely.
Part of it is, I think, franchise fatigue. Objectively the movies all have their good points, but subjectively there are a lot of people who feel that Trek as a franchise was beginning to be on the wane after nearly 2 decades of production, and that the people behind the scenes were becoming very "risk adverse". There was (and still kind of is) a feeling that the TNG movies failed to reach the potential of the TV show, certainly that they didn't make as good use of the show's ensemble.
Personally, I think that view is incredibly unfair. But it persists. (The same perception dogs the later seasons of Voyager, as well.)