I BSOD'd three times before updating to beta AMD drivers. But now I'm running it on high quality and the graphics are fine, decent framerate and stuff. I do occasionally get a key constantly signalling at the worst of times so I run out into an area I'm trying to sneak through and get shot to ****.
As for Sleeping vs Watch dogs, I feel W_D will have a lot more replayability, and I think I prefer the hacking mechanic to the combat in SD, which is kind of boths USP. Hell, I love the hacking mechanics, and doing it seamlessley is so satisfying. Also the ability to be able to choose between stealth and shooting is great. It's really satisfying to take out a whole area full of enemies without being detected once.