I thought that EA MMA was absolutely fantastic. I was a frequent online warrior when the servers were up (played the Undisputed games as well). Sure it had some issues and I would like to see somethings changed when EA UFC is released but if they build it from EA MMA and just keep adding and tweaking it's really now way they can loose imo.
Ditch the singleplayer component except from practice mode and just create the best MMA gameplay that you can. Add the worlds best online mode with features and functions beyond anything we've ever seen in a fighting/sports game and I will never have to play any other game again.