The broken save-game bugs, AI misfire are probably the worst of them all.
There is a much better odds than not you wouldn't see either.
UI/Balance are perhaps greater issues that affect more players. Co-op dialog issues for those playing that way is probably more of an issue. That said it you have the save game bug that is a showstopper, I haven't had that since way early in Early Access. Do you have win 7 - 64?
