StarCraft 2 has a coop mode which is a ton of fun imo, around 18 different commanders which range from “small spin on an existing race” to “essentially 5 hero characters and no units”. You play with a friend or queue up with a random other player and play from a pool of amped up campaign missions.

No other game comes to mind, but Stormgate also promises a 3vAI mode, which will be playable next week on Steam Next Fest.

It’s volunteer work that they get paid for.

To me this looks like WC3 units using the SC2 engine, on a Dawn of War map, which I all like.