So get your PS2 modded and play lots of cheap pirated PS2 games.

 Quit trolling!  Most PS2 games cost less than $20.  Even poor people can afford to buy plenty of PS2 games so there is not reason to steal them.

if i was to name all the good ps2 titles i would be up all night.

so ill just name a few.

god of war, grand theft auto, devil may cry, ratchet and clank, final fantasy, gran turismo, and silent hill.

God of War
God of War 2
Jak and Daxter and the Precursor Legacy
Jak II: Renegade
Jak 3
Jak X
Ratchet and Clank
Ratchet and Clank 2
Ratchet and Clank 3
Rathcet and Clank Deadlocked
Sly Racoon
Sly 2
Sly 3
Haven
Timesplitters 2
Timesplitters Future Perfect
Turok
Kingdom Hearts
Kingdom Hearts 2
Guitar Hero
Guitar Hero 2
Devil May Cry
Devil May Cry 2
Devil May Cry 3
Resident Evil 4
Tekken 4
Tekken 5
Simpsons: Road Rage
Simpsons: Hit and Run
Dynasty Warriors 3
Dynasty Warriors 4
Chaos Legion
Grand Theft Auto III
Grand Theft Auto: Vice City
Grand Theft Auto: San Andreas
Smuggler's Run
Bully
Gran Turismo 3
Gran Turismo 4
Burnout
Burnout 2
Burnout 3
Burnout Revenge
Soul Calibur
Call of Duty: Finest Hour
Tony Hawks Underground
Tony Hawks Underground 2
Tony Hawks American Wasteland

 Why not GT4? 

 Also check out the FF stuff, and Okami. 

samuelrs's list seems pretty complete, although I can't say I would include DW 3 + 4, I would just go for 5, and the tony hawks series has been going downhill since 3 or 4. Timesplitters Future Perfect is probably surplus to requirements as well, TS 2 is far better, although you should only get it for offline multiplayer

@ DarkKnight_DS

The official memory cards from MagicGate/Sony are the good ones. They'll last on you. As opposed to those "MadCatz" memory cards or whatever. Cheap shit.

- Shadow Of Colossus
- ICO
- Final Fantasy X (If your into traditional RPG)
- Final Fantasy XII (A new twist into FF. Some people hated, some liked it. I liked it)
- Gran Turismo 4 (If your into simulation racing)
- Burnout 3 (If your into arcade racing like crazy crashing flips etc)
- Kingdom Hearts
- Kingdom Hearts 2
- Grand Theft Auto III
- Grand Theft Auto Vice City
- Grand Theft Auto San Andreas
- God of War
- God of War 2
- Metal Gear Solid 2
- Metal Gear Solid 3

Ughhh. Will add later. >:)

 tbh, I never played 5, but 3 and 4 provided me with enough reason to visit my mates house on a weekly basis. And, IMO, the TH series started going down hill after THUG2, although American Wasteland was still very playable.

Oh, and how could I forget

Phychonaughts
All Final Fantasy games
Splinter Cell 

Include:

Ico.

Shadow of the Collosus.

Black.

SSX 3.

SSX: On Tour.

Soul Calibur II and III.

God Hand.