Yeah, I'd love to see a good live action JL trilogy. Honestly, I really think you would need at least two movies to really be able to do it justice. With so many characters, IMO it would probably take one movie alone to believably introduce their versions of the characters and bring them all together.
I would love a live action Batman, or Bat related series. As for the approach, IMO I think the way they've gone for a little more realistic feel, but still included comic booky stuff like Killer Croc, and Solomon Grundy in the Arkham games would work great for a live action adaptation.