I mean, it's not a great movie by any stretch, but it also not the worst Trek movie, by any stretch. That's a toss up between Nemesis and Into Darkness, and these days I'd likely rank NEM a step higher. Into Darkness is soooo bad.
I like Star Trek V. Sure it's not the best, but it's a fun, campy movie. It's basically a two hour TOS episode. The crew gets brainwashed and Kirk fights a powerful energy creature. That happened at least half a dozen times in TOS.