I guess with 8th edition out and 25% to use on heroes, he is worth it. Only on larger games though 1.5k + but then I don't see why not.
some of his features look cool, but in the end it's a waste of points IMO. for 300 you get 2 decent scar-vets, or something else - you name it. and by sticking him to TG with a slann you create 1 big target (or 1 big thing to be avoided - and quite easily), with the meager rest of your army possibly not able to do much on its own. maybe in games over 2-2,5K this combo could make some sense....