For the most part, it's safe to assume that if poker is the main subject of a movie then it's bad. Especially if it's a serious movie (The Grand wasn't too bad, for example, because it was a comedy).
The only "serious" poker movie I rate* other than Rounders is Lucky You, but I know I'm very much in the minority on that one. You've gotta have a pretty high tolerance for Drew Barrymore to enjoy it, I think...
* that I've seen - and no, I haven't seen The Cincinnati Kid or whatever it is