I think DC takes more risks with casting; Gal Gadot, Ray Fisher are few examples.
On the X men Brian singer issue, I'm with you in it being too crowded, although in the animated shows like wolverine and the Xmen, it was always crowded but focused on a few set of mutants.
I'm hoping it's not like Xmen 3, where you just get all the mutants at the end just showing their powers, without any character development done on them.
Idris is sure to get a promising role soon, he'll probably seek to Disney to join the star wars franchise, and be a bit of a Samuel Jackson type character. If they refuse, it'll be better for him to move over to WB, I just don't think he's forgettable as a character in Thor