Our animation director Simon put this down in another post and I thought people should see it as they're getting the game (as honestly the running game on All-Madden can be extremely tough without using the feature):
The suggestion I have from seeing a lot of the online vids people are posting from the demo or from early releases we have given to press people is that a lot of people are just used to "dropping control" once they are hit. So they don't even try to break the tackles. You need to break them yourself now. Know your back, know if he is elusive or power, if elusive then juke and spin your way out of tackles, if he is power back truck your way through (you can also stiff arm). You won't be breaking tackles otherwise, no more roll of dice broken tackles, you have to break them. If you fail to break it, you will still see your back try (that's how I know on the vids that people just aren't trying to break tackles enough).
This definitely can take some getting used to...I had to spend a bit of time in practice first to get the hang of it.