Here’s my full list:

1. Undiscovered Country
2. Wrath of Khan
3. Voyage Home
4. First Contact
5. Search for Spock
6. Motion Picture
7. Generations
8. Beyond
9. 2009
10. Final Frontier
11. Insurrection
12. Nemesis
13. Into Darkness

Beyond and 09 weren’t good, but I think Into Darkness was quite significantly worse. It was probably the single least creative movie I’ve ever seen, though I guess some other Abrams movies come close.