Anyone doubting Roberts should check out episode 4 of the prison series OZ, he plays a one off part as a guy on death row, i didnt know about the 'creepy guy' tag he got early on so the OZ casting makes sense. He is also very funny, intentionally, unlike many B-movie actors. Going by that one scene in OZ, i think this guy could play any type of villan and have the audience's undivided attention. After seein a doc on Julia R that compared their career trag's i always felt that this guy was in a league below where he should be working, he was quite winded by her goin supernova while he went bottom shelf for a while, he had got acting success first.
I'm glad Nolan has picked out Eric Roberts as it shows he's still got an eye for the talent without any of the BS that hovers around it deterring his judgement.