1. ST:4 is the 2nd best of the original cast movies. The humor, as you said R2, is very good (Nuclear wessels and What exactly does exact change mean?)
2. I find it interesting that no one, at all, has mentioned Star Trek: Insurrection. I knew it was bad, but not even a word.
BTW: If I had to rank the ST films it would probably be:
2, 4, First Contact, 6, 3, Generations, Nemesis, 5, Insurrection, 1
(5 gets as high as it does meerly for its limited comedic value...Spock attempting to interpret Row, Row, Row your Boat or Scotty's hit on the head "I know this ship like the back of my hand." *smack