Lets deal with this for each of the big three.
NINTENDO :Wii Music will be a critical flop but will sell massively due to Nintendo's current adoring and mindless masses who will flock to it like the little zombies they are. Deadly Creatures will also flop because consumers will think playing as a spider/scorpion is stupid.
SONY: Little Big Planet will be a massive critical success and flop in sales as it is one of those magnificent little niche titles like Okami and Z&W and will be looked upon as a massive failure by Sony. Killzone 2 will get neither critical or commercial success - it will be a subpar shooter with massive problems in every sector, think Lair.
MICROSOFT: Banjo will also be a critical and commercial flop, - only advantage for it is it's being sold as a budget game. 'Lips', the singstar fad is over (thank god) and this is several years late - this game is going to sell a couple thou and end up in the bargain bin.
I'd be more brutal on the Wii but lets face it if you're going to have flops you've got to have games. The Wii doesn't, its holiday lineup is basically Wii Music (which isn't so much a game as an insult) and Animal Crossing (mindless drones, won't flop).
