Well, I can not share your experience on this, Logic 9 / Lion is a stabile combination over here, on several systems. And whenever I do experience some oddities then 99% of the time it's a 3rd party plug which makes my life miserable. It usually is my plugin update negligence which causes the trouble anyways. So I'm sorry to hear things are different where you are!
I don't know anybody who is using ML in the studio environment and I plan to very cautiously try ML next month AT HOME!
Keep up the spirit! -+-=+