There's a decent website that lists all the co-op games and lets you search by features and system.
So you can filter by Xbox360 and online co-op only for example. That'll just bring up a long list but you can scan through, check the age ratings and see if something takes your fancy.
I somehow never new this existed. Learn something new everyday....Thank You
Then feel free to ask here for opinions.
In the Arcade, Battleblock Theater is a fun mostly platformer game with co-op too. From the same developer as Castle Crashers. Lara Croft Guardian of Light is one of the best games in the Arcade IMO, an isometric view twin stick co-op shooter with fun physics based puzzles. For a side scrolling beat em up it doesn't get better than Guardian Heroes. Renegade Ops is another excellent isometric twin stick shooter, I know it has online coop but I haven't checked for split screen.
Strangely enough, I really like Mass Effect 3's multiplayer.
some of my fav online mulitplayer this gen as well. But Im more looking into arcade type games.
Battleblock theater sounds intruiging, Ill have to try out the demo with him this weekend for sure. As for the Lego games, we've played through a few together on local coop, but I want something that features strong online coop so that while he is at his Mom's we can still play together