I really like the actor's work. He was a BIG part of the success "Dead Like Me" and "Criminal Minds."
But if his recent TV work is any indication, even if the show goes on past 2 seasons he'll probably leave the show after 2.
In some ways I can't blame him, maybe he doesn't want to be pigeon-holed / type-cast / etc as "Character X from Y." I mean, people still think of him as the swordsman from Princess Bride.