Feel free to bash away at me if I am wrong, but I like this site and forums, and 'same old shit' here as everywhere.
Again, the save issue has nothing to do with local saves... it is the Steam cloud saves; those saves you make online that you can access anywhere that were borked. Not, I repeat NOT local saves. Fix - save locally... don't have 64K of space?
Second, don't scale anything back. Just turn off the DX11 effects. If the game stutters, just turn off the DX11 effects and get buttery smooth gameplay. You'll miss out on greater particle (?) effects; for example, the Catwoman fight in the bank - without DX11 there is a bit of cash blowing around, with DX11 there is alot of cash blowing around. Did not having more cash blowing around make the game worse - hell no.
Again, sorry. Feel free to bash, but I'm sick of seeing people act like the game is fucked up because of minor issues that affect a tiny minority, and everyone latching onto those gripes without realizing why they gripe (it's not the game, simply easily avoidable problems which don't really affect gameplay if you are not technical illiterate (or a technical elitist)).