Check out the SC2 arcade and co-op missions. They perfectly target the 'mid-core' strategy gamer and Blizzard has pushed a lot of content into them over the pas

Check out the SC2 arcade and co-op missions. They perfectly target the 'mid-core' strategy gamer and Blizzard has pushed a lot of content into them over the past years. I would not be surprised if it dominates the normal ladder in hours played, just like the old Brood War UMS maps. Probably a strong reason why there isn't much competition - why build a new game, when you can weave less competitive mechanics on top of an existing engine and game universe that already has fans?