Why no 'Diablo Style' dungeon crawler?

It seems like a really good fit for using the same game play. I would think the community would play it until there wrists hurt.

and it would be 1000% times better then another freaking card game...(sorry DOTA guys, but come on it would be)

I think a head busting hack and slash with a few of my favorite champs would be a blast. Who would guys like to run though a dungeon?