Favourite - Uncharted: Drake's Fortune and Bioshock
Most Underrated - MotorStorm: Pacific Rift
Most Overrated - Metal Gear Solid 4: Guns of the Patriots
Worst - Assassin's Creed
Show-off - Uncharted 2: Among Thieves

This list is, of course, based on my own games.

Fav: MGS4 Baby
Underrated: Warhawk
Worst: from all the games I played, PES 2008
Show off: Killzone 2, GT5 Prologue

favorite: BioShock
Underrated: Folklore
Worst: Grand Theft auto 4

Why is everybody saying that Folklore is underrated? :/
Do you mean in terms of sales because IGN gave it a 9/10 and I actually think that's overrated.
It might be a little underrated on metacritic (75/100) but not that much.

Favourite: Uncharted 2: Among Thieves.

Underrated: InFamous (In relation to the relative hype it got pre-release and discussion post-release compared to most PS3 exclusives).

Worst: Lair. There is not much about that game that's done right.

Show-off game: Uncharted 2. Easily one of the most cinematic 3D gaming experiences. Ever.

Favorite: Infamous
Underrated: Folklore
Hated: prototype
show: Uncharted 2, MSG4, Infamous

fav uncharted 2
underated warhawk? val chronicles?
worst I have 19 ps3 games. like/love them all. would say that I haven't played a horrible ps3 game yet. can say that I am sure they certainly do exist. I am pretty selective with what I buy. my least favorite game I own is little big planet. many like that game though.

Most Favorite: InFamous
Most Underated: Heavenly Sword
Worst: TIE, KillZone 2 and WarHawk (didn't know it was only a multiplayer game until I purchase it)

Favorite: MGS4 and Killzone 2 (Might have to change this when I beat Uncharted 2)

Underrated: inFAMOUS and Disgaea 3

Worst: Blacksite: Area 51

favourite: uncharted 2
Underated: resistance 2
worst: dont own a bad game

I show off killzone and uncharted 2