Surprisingly difficult, even on Normal.
I have to say, the "Incoming Attack!" music is actually getting on my nerves. It's like the Director, rather than simply spawning hordes whenever he gets bored, has simply fallen asleep on the "SPAWN HORDE" button. Also, Tanks showing up the minute the rescue vehicle arrives. I got incapped literally a FOOT away from the helicopter during the concert finale.
The AI controlled characters seem to be even dumber than in the first game. I jumped over a fence and got pounced by a Hunter, which almost KILLED ME (from almost full health, mind you) because everyone else had to take the long way AROUND the fence.
And Hard Rain. Just...Hard Rain...
But I still like the game. I just need to work up the nerve to even *try* anything higher than normal difficulty...