I haven't played Arkham City (yet?), but I seem to be one of the few people disappointed by Arkham Asylum. Great visuals and characters, but the dull "simon says" style combat and uninspired boss battles put me off quite a bit. It's far better than most licensed games, but I'd have rated it a fair bit lower than the 8-10 scores most people gave it. Decent enough for an easy, kick back and relax sort of thing, though.