Arkham Asylum changed the expectations for what a superhero game could be, just like Dark Knight did with superhero movies. I can't wait to see if their follow-ups (Arkham City and Dark Knight Rises) can manage to meet those expectations.
Both are coming out relatively soon; Arkham City is only two months away. You know you're going to buy it anyway, so why not preorder it now at NewEgg and save $12? Use coupon code EMCKBHG95 at checkout to get discount. Only valid for newsletter subscribers, so make sure you sign up for that first. Currently only for XBox 360.