There hasn't been any patches to my knowledge, but I thoroughly enjoyed the game. The game is unfortunately held back by it's mediocre graphics, stiff animations, unpolished gameplay, and some odd bugs here and there. It's only $20 or so now, if it interests
you, pick it up!
I would probably give Alpha Protocol a high 6 out of 10. Depending on your view of review scores, that may seem low, but IMO it's not.
Ask yourself if you liked Mass Effect 1(assuming you played it), if you did, you will have absouletely no trouble, and even if you didn't, still try it. I'm pretty wary about buying Obsidian games after KOTOR2 and seeing how buggy New Vegas was, but I bought
AP off of amazon for 12 bucks a couple of months ago and I'm really glad I did. I would say the most underrated game of last year.