My second reaction to Angry Birds - right after "hey, this is Artillery with more amusing graphics" - was "hey, this is the virtual version of that game with the blocks, the toy soldiers, and the rubber bands that my dad played as a kid, and then taught to me when I was a kid."
I predict they will sell a lot of these playsets. Video is great but miniatures have a charm all their own.
The secret is the pricing. Back in the old days I spent more money in the first hour of my Magic: The Gathering habit than my wife and I have spent on Angry Birds. Of course, MtG required printing and shipping physical cards.
I know it's execution that matters, but it sort of disappoints me in an idealistic sense that Angry Birds got so widely accepted and liked when the concept isn't original; they just took another game and spiced it up a bit. Still a great achievement, but it makes me feel weird.