I think someone mentioned this before but just as a reference;
GTA3 = 30fps. GT3 = 60fps. If you can\'t telll the difference you need glasses.
Back on topic.. Halo rocks, Half-Life rocks, and how many "Halo killers" for the PS2 have been overhyped already? Xbox has Halo, PS2 has everything else. I don\'t think ANY game in PS2\'s lifespan will beat Halo in that genre, yes even the first one.
And just personally, I preferred Halo slightly over HL. The Co-op mode and the involving charcters/storyline had a lot to do with that.