Star Trek Nemesis
Pros:
Looked / felt / played like a major motion picture, not an unremarkable 2-hour episode
Epic space battle
Soundtrack
Riker/Troi wedding
Good TNG-style central theme (nature vs. nurture...making yourself a better man)
Romulans!
Production/Set Design
Any scenes with Stewart and Hardy eye-to-eye
Scimitar design / Valdore design
Better than Generations and Insurrection
Cons:
Data's death was poorly executed...felt hollow (I don't care that he died...I just think that it rang emotionally hollow)
Befuddling motivation of Shinzon (yeah...I get it...he's damaged goods...but man this guy knows less about what he wants than my wife looking for a place to eat dinner)
Kolarus III / Argo Scene awful awful awful
B-4 (although some of his lines are actually funny)
More singing because Brent Spiner likes to sing
Fanwanky stats to Scimitar's arsenal (127 independent phaser banks, 43 1/2 disruptor cannons, eleventy billion plasma bolt distributors, 5 ray guns, 19 wave motion canons, a catapult that launches diseased meat, 15 shields, 99 deflectors, and 2 screens)
Mind Rape-y Stuff
Reman and Romulan costumes are both crap
Plot with derivative elements of TWOK and TUC
This, in my mind makes it very mediocre Trek...but not hateful Trek.