I've played the full 5 min gamestop pre-order demo tons now. And it does not "suck." The game speed is set to the slowest speed possible(said to be 13% slower than Madden 09 was) and the normal speed is only 5% slower. So just keep that in mind.
Pro-Tak I thought was an over talked addition. But its really, really good. Really makes for some great gang tackles. Theres finally an actual pocket that forms for the QB. Signature throwing styles, stances, and even signature kicker stances all add that much to the experience.
I feel really good about Madden 10.