I used to be very grouchy with MWO, but I played it again a few months ago, and it seemed improved. I mean, it doesn't have a single player campaign or anything like that, but if you want to stomp around various environments in a giant robot shooting other giant robots, it scratches that itch. They even got some of the "unseen" back in their stable. They had to retool some things in the name of balance, though - Clan is still better than IS, but not to the overwhelming degree that canon has it, and mech classes are now a Rock-Paper-Scissors dynamic where Assault beats Heavy beats Medium beats Light beats Assault, and firing several weapons of the same type simultaneously cause exponential heat growth instead of linear (to encourage diversity of weapons in loadouts).
And it's still free to play.