Portal 2 is good, but the writing is pretty hit and miss and while the puzzles are cleverly designed, they get tiring after a while. Really enjoyed the story, though. Arkham Asylum has a brilliantly designed world, great combat and some really cool, unpredictable and at times kinda dark story bits. And the collectables were fun! Only thing holding it down are the lousy boss fights, but that's a pretty minor issue. Vote goes for Arkham Asylum, easily.