I wish I could find the meme that my husband sent me for McCaughney for president, because he'll make everything "Alright, alright, alright."
Anyway, for the role he's playing, anyone who's read the books and remembers how the Man in Black was, I think they'd agree he's actually pretty good for the part. I'm actually pretty excited to see how he pulls it off. He's one of those actors that people really don't take seriously because he's so damn flighty, but that's what the role needs. Walter/Randall/Marten whatever you want to call him was a goofy kind of evil, and always cryptic with how he spoke (At least in The Gunslinger). He's always grinning, and throwing out riddles. I think he'll do well. (But it makes me wonder why he wasn't pegged as Flagg for The Stand remake, if that's even still happening. It'd make sense since Flagg and the Man in Black are one in the same. I know Affleck dropped it, but last I heard someone else picked it up and it was still being made.)
The blessing and curse with Idris is that he's a virtual unknown to people who haven't seen movies that he's played in. I only knew of him from Thor, and if it hadn't been for that I wouldn't have known who he was. However, Roland is such a large character with so many facets, it's going to take a very skilled actor to portray him as he is in the books. Of course I'm biased considering he's my one of my all time favorite fictional characters. The one thing that Idris has going for him is that he looks suave, and that is definitely one of the characteristics that Roland portrays throughout the entire series. He's a manipulative bastard at heart, and he knows how to charm people into getting what he wants (Most of the time anyway). I worry a bit that perhaps he's a bit too good looking for the part, but again, there's plenty of ways he can be 'roughed up' to fit the role.
I'm seriously looking forward to who they get to play the role of Jake though. I cannot imagine a kid actor other than Chandler Riggs who could pull off the role. However, he's already taken and he's a bit too old for the part. Plus, there's the fact that whoever they get to play Jake will age, and in the books, Jake doesn't age that much. Considering the huge undertaking the entire series will be, it's going to be hard. But who knows.
Overall though, I'm looking forward to the day I can walk around with my Oy tee-shirt and people don't stop to ask me "What's on your shirt?"