I think what the Avengers-era movies have shown is that they should just concentrate on making solid films with sensible interpretations that don't go too far off the reservation.
I think too often they try to unnecessarily come up with thing to make the characters work on the big screen. Thing is, audiences get comic book conventions and won't go run screaming from helicarriers, Asgard and aliens running through a portal. They don't necessarily need a Superman with illegitimate children, Hulks with daddy issues, whatever the hell Catwoman was, organic web shooters and so on.
The Dark Knight is the #3 movie ever so it's not like DC can't get on track.
EDIT: Crap, I posted this in the wrong thread! Sorry...