I have no idea about the character you're supposing McNutty for, but after only knowing Dominic West from The Wire and seeing him be pretty damn awful in just about everything else, I can't see it. McNulty was just in his wheelhouse I guess, he's shit every other time I've seen him.
i was flippin thru the channels and watched about 5 mins. of an episode today. man, it's like soft porn. i did catch one episode and the battle scene was pretty good. some guy's intestines got sliced out and another man's head top got cut off. pretty cool.