Mine has to be Asylum since i loved exploring it and finding secrets plus i never knew what arkham asylum looked like until i played that game.

Since Arkham Knight wont be out for a while im just doing the 3 that are out orgins asylum and city.

I doubt they're going to beat Asylum

At the time it was just a complete revelation, low expectations and then BOOM! Really great focus, and it was probably the first "tie-in game" which felt like it couldn't exist without Batman

I haven't played Origins, but I definitely felt that City lost some of its focus and never quite reached the same heights as Asylum

Arkham City is my favorite.

I only played Arkham City but that game kicked so much ass, it's undescribable.

Asylum cause most super hero games aren't very good but Batman proves to us if done right, super hero games can be amazing and everything after feels like a more improved version of that... Its like Mario Galaxy vs Galaxy 2.. Sure Galaxy 2 is better but it doesn't wow me as much as Galaxy did cause the first itteration was so amazing and fresh

City was addictive and an awesome game. Loved the overworld and the story as a whole.

Asylum. It just has a different feel to it than City. And it was the first superhero game that just blew everyone away at how fantastic it was.

Batman Arkham Asylum. Prefered it over City in most ways. Nice level design rather than open world with too many distracting side missions.

Haven't played the Origin one.

I loved Asylum and City almost equally. But like so many others have already said, Asylum really opened everyone's eyes as to how good a superhero game could actually be.

City is the only one I've played and it kicked ass. I will be getting the first soon, and probably won't play Origins.