I think he is probably a bit overrated, but that's most likely just because he is one of the few techno djs who is known outside of the scene. With "studenty" clubs like Bugged Out and Chibuku booking him, he has much more of a media presence than other djs. I mean, a hell of a lot more people have heard of DC than have heard of Lars Klein, or Patrick Skoog, you know? In this way, he is helping to bring techno to the masses. It was his Fuse mix cd, along with Jeff Mills Liquid room mix, which got me into techno in the first place. Then, once established as a techno fan, you move a bit deeper, explore bit more, and find other djs who perhaps suit you better.
Perhaps think of him as a gateway dj, bringing people from the commercial mainstream shyte into techno, and outting them on the right path. Then it is up to them to explore.
Plus, arrogant pr*ck or not, he can mix when he wants to, and he can get a crowd going!