I finally broke down and got the DVD and watched it last night after a ten-year hiatus. It's still not good, but there are things to like in it. I enjoyed it at the time, and still enjoy, the relationships of the Big Three, and there are some good moments for the other characters.
But still too many cringeworthy elements, and not enough plot for even an hour of television, let alone a big movie. The klingons feel totally tacked on, though Klaa has such a great look to him, I forgive it. McCoy has a great scene with the memories of his dad, but the Spock/Sybok thing feels tacked on as well. (though I have to say, I'm not bothered so much that we never heard of Sybok before: I have a half brother who I haven't seen for 20 years, and whom many friends don't even know about, so it doesn't seem so much of a stretch that way).
There's a good movie in here, but the God thing is so tired by the time it comes round again. Like the first movie, our heroes don't get much to do when they are dragged somewhere.
Still it was good seeing it after a long pause, and the dvd features were neat. I liked the deleted scenes (well most of them).