1.Uncharted 2 
2. Demon's Souls 
3. inFAMOUS 
4. Resistance 2
5. Yakuza 3

1. Demon's Souls
2. Uncharted 2
3. Heavy Rain
4. God of War III 
5. Uncharted

Demon's Souls and A Crack in Time would be there somewhere.  Not sure if the Sly Collection would count since they're PS2 games upgraded for the PS3.  After that, I can't say since most of the other games I bought for the PS3 were multi-platform games.

1. Uncharted 2
2. inFamous
3. Killzone 2
4. Heavy Rain
5. Uncharted

Valkyria Chronicles
Demon's Souls
Disgaea 3
Folklore
Unreal Tournament 3

I don't have a PS3 and never played these games but: 
1. inFamous 
2. God of War III
3.  Ratchet and Clank Future: A Crack in Time
4. Uncharted 2
5. Heavy Rain

1. Valkyria Chronicles 
2. Metal Gear Solid 4 
3. Uncharted 2 
4. Uncharted  
5. BlazBlue Continnum Shift 
 
Hmm, I'm not sure if that feels right. I have a hard time ranking my games.

1. Uncharted 2 
2. Ratchet and Clank FutureL A Crack In Time 
3. Killzone 2 
4. inFamous 
5. Heavy Rain...I guess. 
  
@PrimeSynergy:
Unreal Tournament 3 wasn't a - Wait what?
   

Man this is a tough one...
 
1.Demon's Souls
2.Uncharted 2
3.Killzone 2
4.Warhawk
5.inFamous
 
So many great games...

Demon's Souls
inFAMOUS
Uncharted 2
Batman AA
Need for Speed Hot Pursuit
 
Nothing was stated about exclusives. Just favorite games on the PS3.

Nice to see so much Demon's Souls love!  

1. Metal Gear Solid 4
2. Demon's Souls
3. Killzone 2
4. Noby Noby Boy
5. Siren

Exclusively exclusives:
 
1. Uncharted 2: Among Thieves
2. Demon's Souls
3. God of War III
4. Killzone 2
5. Ratchet & Clank Future: A Crack in Time
 
All PS3 games:
 
1. Uncharted 2: Among Thieves
2. Elder Scrolls IV: Oblivion
3. Demon's Souls
4. Batman: Arkham Asylum
5. Dead Space

 Exclusives only

1. Metal Gear Solid 4
2. Heavy Rain  
3. Uncharted 2  
4. God of War III   
5. MAG 
 
I'm hesitant to try Demon's Souls, afraid i'd end up buying a new controller.

1. WipEout HD
2. Valkyria Chronicles
3. Demon's Souls
4. inFamous
5. Uncharted 2

1. Demon's Souls 
2. Uncharted 2 
3. Valkyria Chronicles 
4. Metal Gear Solid 4 
5. Yakuza 3

Favorite exclusives 

1. Uncharted 2
2. inFamous
3. Yakuza 3
4. Ratchet and Clank Future A Crack in Time
5. God of War 3

1. Uncharted 2
2. Metal Gear Solid 4
3. inFamous
4. God of War 3
5. Resistance Fall of Man

"

1. Uncharted 2
2. inFamous
3. Killzone 2
4. Heavy Rain
5. Uncharted

 
@EternalFox: FFXIII isn't a PS3 exclusive...

"

1) 3D Dot Game Heroes
2)  Uncharted: Drakes Fortune
3)  Uncharted 2: Amongs Thieves 

1. White Knight Chronicles 
2. Demon's Souls 
3. InFamous 
4. Valkyria Chronicles

1) Metal Gear Solid 4
2) Motorstorm Pacific Rift
3) Folklore
4) Demon's Souls
5) Heavenly Sword 
 
Sorry, I know it's really short and has no variety in baddies and whatnot, but there's a lot that HS did right.

1. Uncharted 2
2. Metal Gear Solid 4
3. Valkyria Chronicles
4. Uncharted
5. Siren: Blood Curse

1) BlazBlue (don't care if its not exclusive, its the best)
2) Uncharted 2
3) Valkyria Chronicles 
4) Demon's Souls
5) Motor Storm Pacific Rift

1. MGS4 
2. Demon's Souls 
3. Heavy Rain 
4. Siren: Blood Curse 
5. Little Big Planet 2.

1. Uncharted 2 
2. Little Big Planet 
3. Rachet and Clank TOD 
4. Uncharted 
5. The Show 2010

uncharted 2
killzone 2
demon souls 
infamous
yakuza 3

Uncharted 2 
God of War 3 
Killzone 2 
MGS4 
inFamous

1. Uncharted 2
2. Heavy Rain
3. LittleBigPlanet 2
4. Killzone 2
5. InFamous
   

1. Demon's Souls
2. Uncharted 2: Among Thieves
3. Ratchet and Clank: Tools of Destruction (haven't played A Crack in Time yet)
4. God of War III
5. Valkyria Chronicles

"

I'm just gonna list the exclusives: 

1. Demon's Souls
2. Uncharted 2: Among Thieves
3. Ratchet and Clank: Tools of Destruction (haven't played A Crack in Time yet)
4. God of War III
5. Valkyria Chronicles

"

1.Heavy Rain  
2. Uncharted 2 
3. InFamous 
4. LBP 2 
5. Mod Nation Racers 

"1.Heavy Rain  2. Uncharted 2 3. InFamous 4. LBP 2 5. Mod Nation Racers  "

no has mentioned flower yet

1. Uncharted 2 
2. God of War III 
3. Batman: Arkham Asylum 
4. Killzone 2 
5. Castlevania: Lords of Shadow

Demon's Souls
Uncharted 2 
Heavy Rain
Uncharted 1
Joe Danger
 
Have not played enough ps3 exclusives

"no has mentioned flower yet "

1.Supersonic Acrobatic Rocket Powered Battle Cars
2.Demon's Souls
 
(I tried to list the rest, and just couldn't do it) 
so........
 
3,4,5. - Uncharted, Uncharted 2, GT5, LBP, 3D Dot Game Heroes, Crash Commando, Zen Pinball, Wipeout HD, MLB 09 The Show, Killzone 2, Hamsterball, Tumble, Sports Champions, Flow, Shatter
 
@EternalFox said:

" @DelroyLindo said:

"no has mentioned flower yet "

That's a PSN game.... "