ratchet and clank 3
spartan total warrior

Do you like action games, even if they are hard?

Obvious recommendations not worth my time - SotC, FFX, GoW etc. etc., so here're some underdogs...

How about SMT games besides Personas? Digital Devil Saga dilogy or SMT3: Nocturne? If you're not afraid of classic jRPG gameplay mechanics - check them out. Odin Sphere (the previous effort of Muramasa team), maybe? I got it just for fantastic art, gameplay wise - good brawler + some tiny RPG elements, not so bad, but nothing extraordinary.

//The whole series of R&C imo not worth playing, pick up the first one, play it. And if you wanna more - get the rest. I got all of them and, well... overrated, first one was good, sometimes really good, the rest - bo-o-oring - too much of the same.

well since the genre is not important

*Action Adventure

God of War I&II

Devil May Cry 1 - 2 - 3

*Platformer

Ratchet and clank series

Jak and Dexter series

Slay Cooper series

*Fighters

Tekken Tag or 5 (skip 4)

*Car Track racing

GT 3&4

*Street car racing

N4S Underground 1&2

Midnight Club

I tried to keep it small and general so you can pick what you are into

Edit: holy **** how could I forget

if you are into car combat I highly recommend Twisted Metal: Black

The Digital Devil Saga games are a good way to get into the SMT series (if you can find them); they may very well change the way that you perceive JRPGs.

Klonoa 2 is indeed awesome. If you liked the original, it's an absolute no-brainer.

I loved the first Shadow Hearts game and have heard the second is even better, though I've yet to get into it. The third is said to be best avoided.

If you have an appreciation for story-based rhythm-action games, I strongly recommend Space Channel 5: Special Edition and Gitaroo Man.

Other A/S/RPG:

Breath of Fire: Dragon Quarter
Dark Cloud 2
Growlanser Generations (two games in one!)
Valkyrie Profile 2: Silmeria

Other stuff:

Devil May Cry series
Escape From Monkey Island (if you've not played it otherwise)
Gungrave: Overdose
Katamari Damacy / We Love Katamari
Onimusha series
Silent Hill series
The Adventures of Cookie & Cream
The Red Star
Zone of the Enders: The 2nd Runner

I've no particular objections, if the game is fun.

What's the point in having a PS2 if you don't have a Katamari game? You should address this severe Katamari deficit.

Most everybody else is going to recommend stuff you need to look into. Shadow of the Colossus, ICO, what have you. Final Fantasy XII is fantastic if you go into it with the right expectations (equipment is more important than levels, chain enemies to make more money, the characterization doesn't work like most RPGs) and has one of Matsuno's better stories. There are lots of good games.

I am going to recommend a good game that is hard. It is silly, it is puerile, it is made by the folks who made Viewtiful Joe.

It may nont be your cup of tea, but at least you'll have tried it.

I have a feeling he's going to recommend Godhand. I'd recommend it as well, but your views on No More Heroes and Conker's suggests you don't like crazy perverse meta humor as much as me. Still it should be cheap.

I personally recommend the Sly Cooper series.

Good series of platformers with decent gameplay variety complimented by likeable characters. Each game also has a few fundamental changes that differs it from the other two. Also, they should be cheap.

EDIT: Wish I had finished my post before Khuutra posted his response, but It's nice to know I was right anyways. =P

U r missing Persona 3 and 4 (awesum games)