God of War is extremely entertaining and very easy to pick up and play. If you're into fast-paced first-person shooters, Time Splitters: Future Perfect has an INSANE ammount of unlockables and is very fun on easier difficulty levels.

Then again, you'd be very safe with the games you've already listed.. I plan on getting Metal Slug Anthology soon myself.

My Recommendations are...

- Resident Evil 4

Amazing 3rd-person shooter set in a dark, horrific environment.

- GTA: San Andreas

The most free-roaming and gigantic game I have ever played.

- God of War

One of the absolute best action games I've ever played.

- God of War II

The sequel to God of War matches its predecessor in almost every way.

- Jak & Daxter: The Precurser Legacy

A fun and challenging platformer from Naughty Dog.

- Jak II

Jak goes all GTA on us, but the result is a very fun, long, but occasionally frustrating game.

- Prince of Persia: The Sands of Time

Amazing mix of platforming and adventure game.

- Prince of Persia: Warrior Within

Great sequel is more violent and adult-themed than before, but it delivers the goods and an improved combat system.

- Prince of Persia: The Two Thrones

Similar to Warrior Within, but featuring added stealth gameplay and the Prince's dark persona to play with.

- Devil May Cry

Like an old Resident Evil game, but FAST, frantic, and with fantastic controls.

- Devil May Cry 3: Special Edition

Very hard game, but also incredibly stylish and rewarding.

- Tomb Raider: Anniversary

A classic with a PoP-type makeover. More fun than one has ever had with Lara before.

- Onimusha 3: Demon Seige

Resembling Devil May Cry more than Resident Evil, this game is fun and features some of the most jaw-dropping cgi on the ps2 system yet.

- Burnout 3: Takedown

Finally, a greatly fun racing game for those who don't even like racing. It's that good.

Bad Boys: Miami Takedown... I would try to explain its awefulness, but I don't have any idea where I would begin!

Also avoidable - Shadow The Hedgehog. It has the worst aiming system for a 3-D shooter/platformer that I've ever experienced, and would have benefitted greatly by allowing the player to backtrack and try out new story paths without completely restarting the game.  FRUSTRATING!!