The best fighting game ever made, for PS2 or any other system... "Soul Calibur II" comes close (and surpasses it in the minds of those that don't know any better), but VF4: Evolution is interactive one-on-one brawling at its purest and most visually alluring peak.
I cannot say that I have ever played a driving game that has challenged me and given me more feelings of reward for my hard-earned efforts than "Gran Turismo 3: A-Spec."
Highly addictive gameplay that seems to never end, generally impressive visuals, and a portal designed around an interactive worldwide community all combine to make this the best possible solution SCEA could have hoped for with regards to launching it's new 40GB Hard Disc Drive.
Polished online interface + incredible sense of speed (i.e. bikes out of hell!) + perfect arcade handling (wheelies anyone?) + plethora of modes to tinker with + no "GT3: A-Spec"-type customization or realistic physics = the best PS2 arcade racing ever made.
Easily the best Soccer game out there for any platform and even moreso one of the BEST sports games on the market. This is "FOOTBALL" the way it's meant to be.
Sure Blitzball and the Upgrade system irk me a bit but the absolute perfect presentation and plot are worth these minor aggravations. This is the first MUST HAVE RPG on the PS2.