Add to the list, Guitar Hero World Tour.
Aerosmith doesn't have locked saved game. Don't know if Metalica or GH5 have locked saved game because I don't have them.
Can someone who owns PS3 Batman: Arkham Asylum confirm if it has locked save game?
I'm planning to buy the game but locked saved game will be the main factor in deciding to buy either PS3 or X360 version. I know PS3 version has exclusive Joker challenge.