Um... thats one of the reasons all of the skill players got pissed off before the lockout. All of the finesse and ability was taken out of the game. In the late 90's the NHL was a power forward's game. Guys like Primeau and Tkachuk excelled because they were strong on the boards, and in front of the net, and could work through the clutching and grabbing. Now that they eliminated the redline (which basically eliminated the trap), and redefined what really is holding, hooking, and interference, the game is faster and higher scoring. It's just more exciting now. Guys like Crosby, Kovalchuk, Malkin, and Olvechkin would not be playing as well if this was the old NHL.
But yeah... that call was pretty weak. He was caught with his head down. Any good player with their head up could actually make a move around that. It just ended badly because he wasn't looking.
I think the refs called it because it was a little overkill. Kind of like you're allowed to smack a guys stick away. But i've seen refs make slashing calls where a guy smacked a stick so hard that it broke. All in all, i think it's a pretty weak call. But you can't tell me that Hasek didn't think that, the dude wasn't going to get taken out.