The Scuttler - I like the vehicle, as @legomaster1378 pointed out its very Exo-force reminiscent
Batcave - Reminiscent of an older set. Love the design of the cave itself though personally would have sacrificed the Batboat for more of the cave.
Arkham Asylum - Asylum looks 'alright', can understand this working well as a prison set where Harley clearly turns into Harley Quinn and breaks everyone out
Batmobile - Not a fan of this set, villain is a repeat, henchmen look bland and the vehicle doesn't appeal to me
Joker Lowrider - Vehicle looks too blocky, Harley looks neat but not a fan of the rest of the figures
70910 - It seems too lacking in terms of a conflict seems designed solely for the combo model.
70904 - Clayface's legs needed more work, he just has stumps. Set looks 'ok' i suppose, but not a fan of his design
70901 - Mr Freeze is interesting, but I'm not a fan of the design
70900 - Not a fan of this design for the Joker, he isn't intimidating and the trailers seem to make it out that he just wants Batman's attention
At the moment the 'Scuttler' set is the only one i can see myself getting.
In before the movie ends with random citizens putting on the multiple batman costumes we see in the batcave and fighting alongside him... e.g. everyone dressed as a Batman variant