Vladimir Malakhov is a great one. He had the skills to contend for a Norris.
I was frustrated that Andrei Kostitsyn never exploded into a superstar, although I still liked his game, and I don't think the "mens rea" is as severe in his case as it was for Malakhov, so I don't really blame him.
And no, I won't ever consider Alex Kovalev for this category. An artist needs inspiration, he cannot deliver masterpieces on command every single day. Kovalev didn't frustrate me, he amazed me more than any other Hab, and that's what I remember.