Looks like many respondents agree that TNG did not make the transition from TV to Cinema very well. So that begs the question why?
With the exception of TMP, the other TOS films were done by TV directors and producers. If memory serves,
Both Bennett and Meyer were from a TV background. Yet they managed to create films that felt like they belonged on the big screen. Personally I think they would hold up well on the big screen today. Sure the don't have as much eye candy as today's scifi films. But that forced them to tell good stories and not rely on eye candy to keep people's interest.
For some reason B&B couldn't make that leap.
At the risk of repeating what I already said earlier in the thread, the TOS movies all felt cinematic in relation to the TV show, because the TOS TV show had been essentially static in nature, with every episode being self-contained and there being no real concerted attempt to move beyond the parameters of episodic television, whereas the TOS movies built and developed the characters and universe in ways the TV show couldn't have. There's a reason why TWOK/TSFS/TVH holds up as a trilogy (and TUC serves as an fitting epilogue). By contrast, the TNG movies did almost the complete opposite: the TV show had actually been very dynamic, with a universe that grew and expanded in character and depth as it went along, and it was much praised for that at the time, whereas the movies took the view that they should all be stand-alone and independant from each other, with cross-pollination from one movie to the next to be avoided if possible.
What it all boils down to is that the TOS movies felt bigger than the equivalent TOS TV show, whereas the TNG movies somehow felt smaller than the TNG TV show. TNG as a format had plenty enough cinematic potential, we saw that in episodes like "Yesterday's Enterprise", "The Best Of Both Worlds", "Redemption", etc etc. But for some reason, when it came time to actually make TNG movies, they scaled that right down...