Star Trek TMP is a great looking film. The sets and special effects look outstanding. The musical score is also terrific
That said, I find the film to be drag. I've talked to fans that defend it as being closest to the feel of the old show and to a point that is true, but in a more long and drawn out way.
Star Trek has usually been at it's best when it is people talking and debating. That's part of what made the show and the franchise work. However, it only works if they are talking about things that are actually interesting. None of the topic, the reveal at the end, or even the character interactions are that interesting.
I don't care about V'ger, I don't care about Deckard or the bald lady, and Kirk, Spock, and McCoy not being on the same page for most of the film took me out of it too.
I also wasn't a fan of them trying to hide that the actors has aged. It made it feel less genuine.
And this film also went a little too far to glorify the special effects shots. Like I said, they look great but they also really drag the pacing of the film down when they linger on the Enterprise for about 40 seconds too long.
Compare that to Wrath of Khan where age, death, rebirth, and revenge were front and center in the film. Even the discussion Kirk, Spock, and Bones talking about Genesis felt more at home with Star Trek and was at least interesting to listen too.