I'm not very far into the game, but I'm enjoying it. Haven't noticed any significant frame dropping outside the cutscenes, which drop pretty bad. There are also a lot of bugs and audio glitches, but I haven't had it impede gameplay. I'm enjoying the thieving mechanics and I think the first person Assassin's Creed style free running is pretty neat. Overall, I think it's a serviceable stealth game. Nothing real great, but certainly enjoyable.
I once cut through my left thumb pretty bad. I had just gotten Bioshock Infinite too. Needless to say the show must go on, so i just used my palm to move the analog stick around. Felt awkward, but it got the job done.