I use MC Mac pretty often and have no regular crashes. There was an oddball long-standing bug for a while, which was only recently quashed, where it would sometimes crash when you were trying to quit the application. But this was fairly harmless, and was fixed.
It certainly doesn't feel beta to me at all. It runs well, and the DSP has a lot of capabilities. MCWS (the Client/Server system) is fully implemented and works great. I can even connect my mac clients to my Windows server and it works beautifully. About the only place where I feel it "should" be better to be fully complete as-is, is the lack of CD Ripping. That part's a bummer, and I can agree with your feelings there.
I'd like to see more feature parity too, but I don't know that the fact that it lacks Video Playback and Theater View makes it beta. It is just not at feature parity with the Windows version, like basically every other piece of cross platform software I use (some have "better" mac versions, like GoodSync, and most have "better" Windows clients). Jim has clearly stated that the long-term goal is to provide feature parity, but that this will take some time.
If you're having crashes, it would be helpful if you run through the Troubleshooting Guide stickied on this board, and then report issues.
They can't fix things when people say stuff like "it crashes on me sometimes, a while ago, and that's annoying".