Are you able to keep it patched up? (Although I'd hope the rerelease already contains the patches!)
I played like 4 months on the original realease on Playstation, and didn't have anything I'd consider a huge issue. In probably 100 hours or more, I had it crash maybe a half dozen times, and it saves so often they weren't huge deals. And I had this graphical glitch very occassionally when going through doors, that I could fix by turning around and going back through (and then back again to continue doing what I was doing).
Annoying? Yeah, but the game's INCREDIBLY complex...not to play, just what they're doing in the background, the world it's creating, so the occasional issues I had seem for better or worse pretty reasonable. But sounds like you're having way more problems :-/