I really like the game, but there are still some save game issues. Yesterday I was halfway through episode 2, today for no apparent reason I'm back to episode 1. :(
Really buggy, survival mode gets to a point pretty quickly where you can't ie and also can't do anything. I have never complained about a challenge before, but I must say that this was a terrible choice.
The one thing I noticed most is a problem with the siingle player AI, as was mentioned in an earlier comment. It's especially bad that characters with only short range attacks do not close.