APB: Reloaded is the rebooted free to play version of the doomed original, All Points Bulletin. It's still a free-roaming violent massively multiplayer online game, but it's been improved in some areas. It's not exactly GTA online, and it has flaws, but APB: Reloaded is worth trying out.
The basic missions in APB: Reloaded see you playing as Enforcers or Robbers. Basically one side will be trying to achieve something, while the otherside has to stop them. This is sometimes fun, but often you'll find your fun spoiled by 'griefers' - other players who just want to ruin your mission. All online games are at risk or griefers, but they seem particularly prevalent in APB.
Driving is pretty well handled in APB: Reloaded, but the shooting can be frustrating. Running around creating chaos is fun for a while, but the repetitive missions and bland cityscape soon start to spoil your enjoyment.
Sound, graphics and customization
The sound is pretty good in APB: Reloaded, but unfortunately the graphics are look a bit dated. It looks and feels like a cheap Grand Theft Auto, although this seems to fit with the garish customization that's allowed! In APB: Reloaded, you can pretty much customize whatever you want. It's not quite Saints Row, but you can get some very funny results is you play around with character customizations.
APB: Reloaded is free to play, so there's no reason not to check it out for yourself. If you're waiting for GTA V and want somewhere to create violent havoc, APB: Reloaded will provide this. With more accurate shooting and more mission variety, this good be an good game, but currently it still feels like a mess, albeit a fun one.