Arkham Asylum was a very good game. The combat while simplistic was at least some what novel and the combat wasn't the main focus of the game. It was paced well together with Metroidvania style adventure, stealth sections and puzzle solving.
Arkham City expanded the formula to an open world and gets some credit for that because it's more of the good stuff.
However with Arkham Knight, the formula has gotten stale and the vehicle sections really put a damper on the game. Now the series has pretty much peaked out. The combat has lost all novelty especially since so many other games have also started copying that combat.
Anyone else have trouble getting into other games, especially single-player games, after getting into fighters? My friend told me he calls single player games "vacation games" now because they're nothing compared to the brutal difficulty of a fighting game.
Not at all I still enjoy playing single player games. I just finished the Bloodborne DLC and just finished the Scholar of the First Sin on the PS4 (going for the Platinum next). I also occasionally play Diablo 3 here and there, getting ready for the next major patch. I kinda want to get back into Path of Exile as well... the true game for theory crafters!
Single player games can be brutally difficult too though it's really more self imposed. You can try to play Bloodborne without leveling up your character and see how far you get. Or try to play DmC DE with all the difficulty modifiers in place.