Absolute Must Have PS2 games ??

[Kazekage Gaara]

Guys, am getting a little bored of the new PS2 games that I have, so I decided to look back and see if I missed out on some great titles So what would you recommend a guy who loves Action Games, Platform Games, etc and also sometimes loves FPS games if they are really good

Thanx a lot in advance

Edit: Please keep standard RPG games out. I already have so many of the good ones, heck even got FFXII, but I get bored of them pretty easily. Although I do love Action RPGs like Drakengard and the like

Edit II: I usually hate sports games but totally fell in love with Virtua Tennis 3 for PSP and played the hell out of it, and then I found out there is a PS2 version also albeit an older one by Sega named Sega Sports Tennis, and am totally loving it Are there any other PS2 Tennis games that I should look out for

Am also seriously looking forward to those kiddish Power Pro Kun Baseball games that Konami releases for DS and other consoles and is going to release the PS2 version pretty soon