I finished watching The Final Frontier a couple nights ago, and it was actually pretty good. Definitely nowhere near unwatchable. My biggest gripes are the unnecessary cheesy humor ("I know this ship like the back of my hand!"), the somewhat dull climax, and the fact that the entire movie seems to directly contradict the TAS episode The Magicks of Megas-Tu (where the Enterprise goes to the center of the galaxy, there's no Galactic Barrier, and they witness matter being created and get sucked into a parallel universe), but then again, much of the time the original episodes contradicted others anyway.

I do, however, wish Sybock's "Let me feel your pain" or whatever thing was explained, you know, at all.

My revised list, best to worst:

- The Undiscovered Country
- The Wrath of Khan
- The Final Frontier
- The Motion Picture

Next up are The Search for Spock and The Voyage Home, which I remember so very little of that I didn't feel right in putting either one on the list with the other four.