Online for me was wonderfull on day one when I got it at midnight and played it for 4-5 hours. It was very fun going around in the different match types with my friends. I personaly did not enjoy GTA IV multiplayer. This however has been very fun so far.
Ever since then though the 360 online has been unplayable sadly. You can get into a Free Roam every once in a while but it doesn't last =(. Hopefully they get that patch out soon. They released a little update yesterday but that must of been for something else. The one positive to multiplayer being broken is I'm playing the single player =b