Summary: After the success of Arkham Asylum, Arkham City should have taken the best things from that game and improved upon them. In some ways, it did: the side quests were extremely interesting and entertaining and for any huge Batman fan would love the appearances of Hush, Azazel, Deathstroke, etc., and getting to see Catwoman and Robin in the game was a nice touch; the change in flight/gliding capabilities was also an obvious improvement to the game.
Summary: Batman: Arkham City's graphics & gameplay are second to none. The first game was already a masterpiece & this one up the level of gameplay & details. Gamers of all genre should give it a try & marvel the fluid animation & challenging gameplay, not to mention the fantastic sound & great storyline.