Many people think Mass Effect 3's Multiplayer should have been more similar to Battlefield or Battlefront with large-scale epic battles and the like; Mass Effect: Unification does just that.
Not sure if it'll make the next version or not, but there's at least one more on the way. This map has been killed and restarted twice now. But it's definitely been worth it, we love this part of the ME3 campaign.
"This is Rannoch, the world of our ancestors. Our bodies carried the seeds that spread the desert grass." - Tali'Zorah vas Normandy
To-do: Add custom Rannoch foliage, crashed and burning ships, fix collision and low-polyness, add nighttime environment to alternate with the dawn one, and some kind of Geth base. And maybe Quarians.