Batman: Arkham Asylum was one of the top hits of 2009... The best news about Batman: Arkham City is that it's a sequel that lives up to and even surpasses the original. AC's virtual world is roughly 5x larger than the environments of Arkham Asylum, but much smaller than a full-scale implementation of Gotham would've been.
Arkham City is a great game, period. It neatly refines, improves, and extends the original concepts; it's clear that the developers took the source material and elements seriously and set out to build a work of art. They did so. By all rights, Batman: Arkham City is Game of the Year material.
Unfortunately, what should have been a great experience has been substantially diluted by myriad delays, buggy launches, and continuing problems...
Batman Arkham City Review, DX11 Explored