I say awesome. I, like everyone else, loved everything about the first Batman: Arkham Asylum and I feel it speaks really well that an unknown newcomer like Rocksteady Games can rock our worlds with the first good Batman game ever (and a rare piece of quality licensed work). Its nice to see them not only expand deeper into the Batman universe, but also do so with the finely polished third person gameplay the market had not seen in a long while.
Lets just hope as much effort goes into adding depth to the gameplay formula that made the first one so great. Too many sequels have forgotten what made the first one so much fun to play.