Personally, I think he's a pretty cool guy who may not be the "best" actor, but actually i liked the much-reviled Chronicles of Riddick because, personally to me, the setting trumps the plot - and the universe he was creating in that had an appeal to me. Butcher Bay was a great game, I've heard good things about Dark Athena as well and may try it if I can be bothered to buy a current gen console.
So this MMO could be cool. I'm not sure how it would work, but I would be interested to hear more as it comes along.