MGS IV: Hit
GTA IV: Hit
Resistance 2: Hit
Little Big Planet: Reviews will be a hit, sales will be in the Ratchet and Clank area, which I consider to be a flop for the quality and title of the game.
Haze: Suprisingly decent, sales won't be high, but the game will get better reviews than people think
Killzone 2: A mild hit. The graphics will be the best seen this gen and the gameplay/online will be good, but not great, however PS3 fans will prefer R2, so by a lot of people's standards, KZ2 flops.

only flop will be haze

1. Haze: Average
2. Metal Gear Solid 4: Guns of the Patriots: Hit
3. LittleBigPlanet: Hit
4. Killzone 2: *Shrugs* I have no idea
5. Resistance: Fall of Man 2: Hit
6: Grand Theft Auto 4: Hit

None will flop, but I'd hope that Killzone 2 would flop. Oh well.

Flop: Haze... Even the developer just says it is a "good" game. And Killzone 2, not much good press other then it looks beautiful.

Possible Flop: Little Big Planet (Some people just don't get it)

Hits: GTA IV, R2, MGS4

I think the only flops will be LBP and Haze. And maybe Killzone 2. But the rest, I think, are going to be a hit.

Hits:

MGS4, LBP, R2, and GTAIV

LBP will be a critical success, if nothing else, but I believe it will have incredibly long legs.

Possible flop:

Killzone 2

Guerrilla's changed. Sony's putting everything they have behind this game (budget, manpower, third party contacts, etc.) for a reason. I believe it will do well, and all of the technical problems of the first will be gone. The fact that it looks beautiful should make shooting shit up fun as hell as well. That being said, we don't really know how it will turn out, and previews aren't the most trustworthy of sources to judge a game on.

Probable flop:

Haze

Free Radical are veterans in the FPS realm, but just about every preview of this game has said it looks and plays like an average shooter. Let's hope that 4-player co-op combined with a little bit of Nectar will make this game an enjoyable experience all around.

 well said, i very much agree.

KZ2 and Resistance 2

Well I agree with most of the people here, Haze, KZ2 and LBP, any of those could end up being a flop...

MGS,RFM2 and GTA will enjoy a nice amount of sales...