Actually I think the running game has improved from 11. I thought running game was too easy on 11. In reality running game is not easy either. In 11 i was able to drive through the defensive line pretty often. now it's more difficult. I can still run a good running play, most of the plays i do is running. I hardly pass and so far so good. The last time I played, I ran the ball in after a kick return. I really wish there was a replay feature.
There are some glitches in the game such as: The rival team dancing after I sacked their quarter back. Madden saying that It depends on the coaching on what play to do even when it's the 2nd down. in 11 he always said it on 3rd down.
I hate the playbook layout, everything is in one sequence. In 11 you had different categories of Run, Short Pass, Long Pass etc. Having the layout the way it is now, kills the play clock because have to go through all the plays.