I thought the casting was pretty decent in STXI, except for Scotty and Chekov.
What I really hated about the film (Besides the black hole stuff) was that there was no cleverness to Kirk's tactics. He just beamed in and shot everyone.
But overall I did like the movie. And I will probably like this one.
Just, this is a different Star Trek than the Star Trek I grew up with. It's a good franchise, but it's a completely different franchise, bearing no relationship with the previous incarnations except for character and place names, and the fact they both occur in the future in space.