One of the TNG movie series' biggest downfalls, IMO, is that there are no story arcs through the series. They are all stand alone adventures with no sense of continuity, which is one of the strongest aspects of Treks II-IV. You feel like you're along for the ride with the characters, watching them grow. In the TNG film series, you don't feel as involved.
Totally agree, and it's something that I'd long come to the same conclusion about myself.
The TOS Treks all had an
ambition about them; a drive to present us with an experience that for want of a better word was truly 'theatrical', something
new that we hadn't seen before in the TV episodes. Suddenly, the episodic nature of Star Trek was being blown wide open. The fact that the narrative spilled over into the next movie and then the next and then the next was a key factor to giving them a shot in the arm. It felt like an ongoing story rather than a set of arbitary stand-alone adventures. In so doing, the TOS movies all built upon each other, and together they added up to a much bigger whole than just the sum of their parts.
By complete contrast, the TNG movies always felt like mere
supplementary adventures in an ongoing franchise. They never had the same weight. They seemed to lack the same ambition to do genuinely big things with the 'verse, and to take Star Trek (forgive me) where no one has gone before. Which is ironic, as TNG as a TV series had been
completely the opposite, always adding new layers to the mythology, which was in my view a big part of its appeal.
The TNG movies also contrasted horribly with what
Deep Space Nine was doing at the same time on television as well. With every passing season, DS9 felt important. Like TNG before it, DS9 was never keen to run on the spot, all the time it was escalating situations and exploring new aspects of the Star Trek universe. The TNG movies felt by comparison... low-key. Irrelevant. Inconsequential. Insubstantial.
It isn't co-incidental (in my opinion) that the movie franchise lost its way when the keys to the movies were handed over to Rick Berman. Before 1994, Movie Trek and TV Trek were treated as seperate productions. But suddenly, we had the creative reigns of the Star Trek brand as a whole being placed in the hands of a single set of individuals, who were to produce it across every version of Star Trek, TV and Movie alike. And I think quality control went south as a result.