Owned (MUST HAVE)
Uncharted
MGS4
Top Spin 3
GTA IV (I think I want to sell this soon)

Many had played before with renting and sold. So I think they are not a MUST HAVE game but worth to play through once
assassin creed, dmc4, virtua tennis 3, folklore, burnout p, ninja gaiden s, winning eleven 2008..

1. LittleBigPlanet
2. Winning Eleven 2009
3. Uncharted Drake's Fortune
4. Top Spin 3
5. Metal Gear Solid 4
6. Resistance 2
7. WWE SvR 2009
8. Silent Hill Home Coming (Selling)

Sold most of the games aredi which I dont think it's a must have game like DMC4, GTA4, Assassin Creed.. Probab'ly because my PC can support so it's a waste for me to keep them. Some other games tried before n just dont enjoy it so nvr buy. Games like burnout and FarCry2..

Must have for PS3
inFamous
Killzone 2
RE5
MGS4
SF4
Top Spin 3

So far that these are the games I'm gonna keep it.
Final Fantasy XIII
Resident Evil 5
Uncharted 2
Killzone 2
Devil May Cry 4
Infamous
LBP
Metal Gear Solid 4

Games that I've sold cause I wont even replay them. But they are still worth to play through at least once:-
Demon's souls
Assassin Creed I
Assassin Creed II
Grand Theft Auto 4
Heavy Rain
Street Fighter IV (waiting for SSFIV)
Winning Eleven 2009
WWE SvR 2009/10
Uncharted Drake's Fortune

Games that I've played before or sold cause it's not great at all to me.
Dragon Age Origins
Star Ocean 4
Call of Duty Modern Warfare 2
Prince of Percia
Resistance 2
White Knight Chronicles
Dead Space