There's nothing wrong with the PS3 online. Apart from the uber-lag, the stats getting reset everytime you leave, and the Americans with their annoying squeaky voices. Apart from that, and the fact that something like 75% of people bought it for Xbox, there's nothing wrong
IV still has that stupid GTA car-spawning bug. I first noticed it in Vice City, I dunno if it was there in 3...basically, if you're driving along an empty road (or even if the cars in front are a good bit ahead), and you look behind you, when you look forward again, cars randomly spawn ahead of you, which is
not good if you're doing 100+mph down the highway on a bike...that killed me 3 times today