I've been on 9.1 for months--mostly stable. No showstoppers. Had to manually send records to the portal for every visit to get Meaningful Use credit.
I'm game for 9.3 if no new showstoppers. Mainly hoping the occasional "AC has to close" crashes will be fixed.
So far I would not characterize the releases as "not ready". Just have the odd minor bugs that we expect. Glad they are quashing them slowly.