I enjoyed TUC, however it is far from my favorite.
A lot of the time, the movie felt forced...with too many scenes that were 'cute' and contrived to give the characters something to do.
Trek 6 never fully recovered from the mis-step of Trek 5. The characters somehow felt less real. It felt like, ok...this is a Trek movie so we have to hit this point, this point and this point.
I'm just not into that.