The difference is that you could play the demo for all the time you wanted, so yeah is even worst than a demo.
How is this worse than a demo? Have you ever played a Madden demo? It's not even worth playing for more than 1 hour. In the demo you get to choose from 2 teams with 2 minute quarters with the clock speed set on fast. The early access is 6 hours of access to the full game. Thats a pretty big difference.