I dunno, the second time I watched, I was eager for things to pick up so that my sister, who was watching with me, could get as blown away as I had been watching the show. I think the movies get rid of a lot of the stuff I didn't care about, but I suppose that comes down to personal opinion. If someone had the time, I'd tell them to watch all 12 episodes. But for people less willing to spend that much time on a show, I'd tell them to skip that and watch the movie, then.
I feel like anime translated from a serial into one or more movies tend to develop serious problems with pacing. You miss out on extensive character development and get periodic forced dumps of exposition so the whole thing ends up shallow, blunt, and unenjoyable. I haven't seen MM in particular but this was true of the new Eva movies for example (though it was the least of their problems). It's the same problem with translating books: There's too much content for a movie to fit comfortably.