I disagree with the Bioshock part. Bioshock was a great game. I have not played Bioshock 2, so I cannot judge, but I have heard that it was worse than the original, and I believe it. Infinite, however, has a completely new storyline, and looks as if it will be just as good, if not better, than the original. Sorry for going off topic.
I find Bioshock 2 to be significantly better in almost every regard. Better art, more belivable characters and situations, stonger narrative themes, and tighter, dynamic combat. Play it. It's absolutely great.
On topic, I really hope that Dishonored does not release near Infinite, as both groups are aiming towards a similar crowd. Infinite's crowd is significantly larger though because of the mainstream appeal that the series has achieved. I could see that really screwing Dishonered over.