I agree. The new fear take down is amazing and it really does make you feel like Batman.
Dual play combat (and the dual take down) is fun too. I wish there were more of it to be honest.
I think that would have been awesome too, a "free roam" mode to be able to play as any of the characters you have (Batman, Nightwing, Robin, Azrael, Catwoman, Red Hood, Harley Quinn etc). I know there's a PC mod for it, but it would have been great to have it utilized as a feature.
I'm disappointed about the lack of a challenge mode. Sure, there are the AR challenges but in contrast to Batman: Arkham City and Arkham Origins, they seem quite stale. In City/Origins you could not only select what challenge you wanted to do (e.g. predator map, combat map, difficulty etc) but you could select a character. In Arkham Knight, you can only play as Batman, unless you specifically select an AR challenge that involves another character (e.g Azrael, or Nightwing in the Gotham Knights challenge).