Been playing Metal Gear Solid: Peace Walker recently online,
The servers are quite quick even with a shit connection like mine.
I'm not normally keen on playing online because, well I suck with my reactions these days to be honest, but the online coop is nicely blended between difficult (so many...rations) but easy to assist each other.
I find stealth missions a piece of piss,
But tanks/helicopters/metal gears/dinosaurs (yes dinosaurs) are a hell alot of fun when you have a range of players to work alongside with.
Single player I try to stealth it and kidnap..."hire"....err...all the enemy troops,
You knock them out and attach balloons to them...like UP if he had to make the house fall asleep first.
"What do you mean you left you're keys in there?!"
But coop...I havn't had so much fun being a medic without feeling cheated out of fun (serious fire power to boot) in long time, especially once you have a cardboard box in a style of an ambulance.
When you can use this thing to save a life, your inner child thanks you.