Our goal isn't actually to make a hard game. Our goal is to make a game that suits your skill level, whatever it is.
As for whether we've succeeded, we've tested the game on a few hundred people, both hardcore and casual, and have only had one dissatisfied tester (it was a 5 year old who was playing an early build that was way too hard. Honestly I'm impressed he played it for as long as he did). In particular the good folks at Microsoft and Valve seemed to have a great time playing today. (Hooray!)
As for whether we've succeeded, we've tested the game on a few hundred people, both hardcore and casual, and have only had one dissatisfied tester (it was a 5 year old who was playing an early build that was way too hard. Honestly I'm impressed he played it for as long as he did). In particular the good folks at Microsoft and Valve seemed to have a great time playing today. (Hooray!)