Absolutely without question, Def Jam Fight for New York. Me and my friends spent absolute hours playing that game.
Def Jam fight for NY and Shadow of the Colossus
THPS
I liked the Katamari Damacy and Legacy of Kain games, also Ico was pretty cool
Timesplitters 2
I remember first going through MGS2. Up until Raiden I thought this was going to be the best gaming experience ever. Still liked it, but the story was just weird looking back on it.
I’m going to give a weird answer, but one of my favourite gaming experiences on the PS2 was Katamari Damacy. I was in Uni and we had some friends that didn’t play games but LOVED Katamari and we would take turns on that.
Gran turismo in all its versions is probably what took most of my time. And GTA.
But let’s go with Silent Hill 2 to highlight something I only played on PS2.