Most people disagree, but I love Generations. It isn't so much because the two famous captains come to join forces, but more to do with Guinan, I think. I also love the Nexus. Wish I could live there for eternity. I can't deny there are some major plot flaws in the story, but I still think it is a brilliant film.
On the other side of the coin, I can't stand NuTrek. It might have brought in a new generation of fans, but it completely disregards what Star Trek is all about.