Before Grand Theft Auto V [official site] came out, I imagined I'd vanish into GTA Online for a few months for freeform sandbox shenanigans with a load of other folks. Turned out, the online side's open world itself was pretty dead (aside from folks with superguns kindly supermurdering me until I turned on Passive Mode) and the action involved lots of boring lobbies and waiting and loading. It was not the dynamic world I'd hoped for. Well, I'll be dropping back in tonight, now that Rockstar have livened things up.
Without loading or lobbies, Freemode Events will frequently spark off across the world. Or you'll become a werewolf and need to flee everyone. Or you'll need to jostle for position in an ever-shrinking area with other folks to avoid being exploded. Try to cause as much property damage as possible within a set time. Fight for control of a particular area. Loads of stuff.
That all sounds grand, and exactly the sort of fun I'd hoped for in GTA Online - more Saints Row than Grand Theft Auto, I suppose.