I'll spell out why I liked Nemesis....
-Because despite its many flaws, it FINALLY looked like a big screen movie, and not a two hour television episode like the first three Next Gen movies did.
-Because it kicked ass in the action department, and didn't blow its wad in the first ten minutes like First Contact did.
-Because it had Picard driving an armed dune buggy, and looking for a moment like he was actually having fun. (also because that scene makes all those pretentious know it alls who think they know Picard, and what he will or will not do, cringe and squirm uncomfortably. Sorry, only the writers and Patrick Stewart know what Picard will and will not do.).
- Because the last half of the movie was one big assed space battle....full of effects and external shots too, not just two effects shots and the rest being internal shots with a bunch of dialogue and camera shaking to simulate hits. "They're firing again, sir!", "Return fire!", "Weapons firing, sir!" for the other 90 percent of the battle.
-Because of the shootout on the Enterprise. Didn't care for how they got the extra decks, but that didn't bother me either.
-Because it also has my favorite score of all the Next Gen movies...from the uptempo opening moments, to the space battle, to the end credits theme that was made/or restored for the home video release. The late, great Jerry Goldsmith's finest Star Trek score since TMP in my opinion.
In terms of story, and some tech areas, Nemesis was deeply flawed. As a kick ass two hour action movie for Star Trek, it rocked.
It is the only TNG movie I liked, and one of only 3 of the first 10 Star Trek movies I liked at all.