I played Killzone 2 and aside from wonderful graphics I wasn't blown away gameplay wise. I played Resistance 2 on co-op mode and loved the gameplay but wasn't blown away by the graphics (it was splitscreen so that's probably why)
All in all I think the PS3 is not bad at all. My friend was on 1080p and I'm on 1080i so it's hard to judge actual graphics of PS3 vs. 360. But what got me was how similar the two systems are. So many things are identical on both systems. Interface may look different but underneath it's very similar. But 360 just does everything much better!
And it dawned on me, 360 and PS3 gamers are ALL idiots for fighting tooth and nail like we do. I would be happy if I only owned either system. I might hate not having some 360 exclusives or not having some PS3 exclusives but I think I would be happy with what I had. Now I can't figure out why the big "war" when obviously the HD consoles are step brothers they are so similar.
But I still hate sony fanboys as much as they hate microsoft fanboys ;P