not very many people play the ps2 anymore have you noticed. i like the ps3 and exbox too but ps2 started for those too if you think about it. so i know pretty much anything about almost any ps2 game. need help on a level. ask me.
Luckily, due to my lack of money (I'm a student), The PS2 is my most recent console, even if it is 70 miles away from where I am. It has all the greats; Timesplitters, Dragon Quest 8, even the Sonic Mega Collection!!
Nothing can ever beat the PS2 in terms of varying gameplay, at least until the newer consoles become more popular.
One of my favourite games for the PS2 would also have to be TS:FP, although the challenges in TS 2 were better IMO. I do love playing Sonic 3 & Knuckles though, I think I'm addicted to it lol