Here's a list of the best current PS2 games in my opinion:
<B>Gran Turismo 3 A-Spec
Grand Theft Auto: Vice City
Grand Theft Auto 3
Metal Gear Solid 2: Sons of Liberty
Devil May Cry</B>
Tony Hawk's Pro Skater 3
<B>Prince of Persia: The Sands of Time
Final Fantasy X
Final Fantasy X-2
Jak and Daxter: The Precursor Legacy
Jak II
SSX
SSX Tricky
SSX3
Tony Hawk's Underground
Virtua Fighter 4: Evolution
Soul Calibur 2</B>
Baldur's Gate: Dark Alliance
ICO
<B>Ratchet and Clank
Ratchet and Clank: Going Commando
Suikoden III
Frequency
Amplitude
Disgaea: Hour of Darkness</B>
Maximo: Ghosts to Glory
Red Faction
Red Faction II
<B>Silent Hill 2
Silent Hill 3
Resident Evil Code: Veronica X</B>
Ace Combat 4: Shattered Skies
Half-Life
Midnight Club: Steet Racing
Midnight Club II
Tom Clancy's Splinter Cell
<B>ATV Offroad Fury
ATV Offroad Fury 2</B>
Dark Cloud 2
<B>Beyond Good & Evil</B>
Kingdom Hearts
Need for Speed: Hot Pursuit 2
<B>Need for Speed: Underground</B>
Star Wars: Starfighter
Star Wars: Jedi Starfighter
Tekken 4
True Crime: Streets of L.A.
Colin McRae Rally 3
Def Jam Vendetta
Kelly Slater's Pro Surfer
Lord of the Rings: The Two Towers
Lord of the Rings: Return of the King
Onimusha: Warlords
Onimusha 2: Samurai's Destiny
Rayman 3: Hoodlum Havoc
SpyHunter
War of the Monsters
Rayman 2: Revolution
SOCOM: U.S. Navy Seals
<B>SOCOM: U.S. Navy Seals II
The Mark of Kri</B>
Xenosaga Episode 1: Der Wille zur Macht
Dead or Alive 2: Hardcore
MDK2 Armageddon
Smuggler's Run 2: Hostile Territory
Tekken Tag Tournament
Time Crisis 2
Time Crisis 3
Burnout
Zone of the Enders: The 2nd Runner
Fatal Frame II: Crimson Butterfly
Manhunt
Tenchu: Wrath of Heaven
Freedom Fighters
Hitman 2: Silent Assassin
Rygar: The Legendary Adventure
Metal Arms: Glitch in the System
Aggressive Inline
Winning Eleven 6 Final Evolution
Klonoa 2: Lunatea's Veil
Onimusha 3: Demon Siege
TimeSplitters
TimeSplitters 2
Ape Escape 2
Burnout 2: Point of Impact
Castlevania: Lament of Innocence
Guilty Gear X
Guilty Gear X2
Romance of the Three Kingdoms VIII
Sky Odyssey
Soul Reaver 2: Legacy of Kain
WipEout Fusion
Champions of Norrath: Realms of EverQuest
<B>Final Fantasy XI</B>
Harvest Moon: Save the Homeland
La Pucelle: Tactics
Maximo vs. Army of Zin
MX Unleashed
Quake III: Revolution
Spashdown
V-Rally 3
Escape From Monkey Island
Romance of the Three Kingdoms IX
Dynasty Warriors 4
MTX: Mototrax
Mortal Kombat: Deadly Alliance
Victorious Boxers
Wakeboarding Unleashed Featuring Shaun Murray
James Bond 007: Everything or Nothing
Moto GP 3
Rez
Ring of Red
Romance of the Three Kingdoms VII
Samurai Warriors
Sled Storm
Shadow of Destiny
Sly Cooper and the Thievius Raccoonus
The Suffering
Silpheed: The Lost Planet
State of Emergency
Breath of Fire: Dragon Quarter
Hunter: The Reckoning Wayward
Robotech: Battlecry
Drakan: The Ancient Gates
James Bond 007: NightFire
Downhill Domination
Gladius
Gladiator: Sword of Vengeance
kill.switch
Le Mans 24 Hours
Legacy of Kain: Defiance
Medal of Honor: Frontline
Medal of Honor: Rising Sun
The Simpsons: Hit and Run
The ones in bold are the games worth paying $300 for the system to play. Hope this helps. I used Electronic Gaming Monthly and IGN.com to help make this list, as well as my own opinions.
-Lasereth