It sounds to me as if the game will mirror MMA in real life. By this I mean that the striking will be easy to understand even for a first time user but as you get in to the game you will learn to enjoy and eventually master the ground game.
Don't really like the sound of this bit or the striking being button based but the groundgame sounds awesome. Man I've got such high hopes for this game I just know it's gonna dissapoint me in some way.
The main thing I want is for you to actually require some MMA knowledge to be able to really play it well, so just anyone can't come in button bashing and win.