IE felt less implemented than in Madden last year. It was less noticeable, but still apparent. I saw a few instances of gang tackling and very little stumbling and rubber legs like in Madden 13.
Running was better. The footplanting and burst mechanics cause you to more carefully choose when to make moves. CPU runners are super dangerous. I played against D'Anthony Thomas and he was dangerous and scary on default AA. Carved me up and forced me to bring my support in an effort to stop him.