Was moving 'The Next Generation' over to movies a bad decision?
Yes. Next question? :-)
Not much more I can say here that hasn't been said. Rightly or wrongly, the moviemaking gods didn't feel that TNG's small screen formula could work on the big screen. Thus, they gutted everything that made TNG such a beloved show and put a standard sci-fi action flick in its place.
There's nothing wrong with a good sci-fi action flick. As a one-time effort, First Contact was fine. TNG did its occasional action episode too. But the problem was thinking that those were the only kinds of stories they could successfully tell on the big screen.