Personally, I like slower speed, especially in comparison to NCAA. I will be testing the normal speed before deciding which speed I'll stay with, but isn't it great to have options with the speed slider.
Everyone is different, what feels realistic to one, may feel unrealistic to another... it's all subjective.
If Madden played as fast and twitchy as NCAA, I probably would not pick it up. On the other hand, if NCAA had a speed slider option, I'd probably keep it.