Absolutely not, I think the full game is way better than the demo, playing the xbox360-version: Animations are smoother, control is better, AI of my team and espescially from the opponent-CPU is considerably better.
Gamespeed at 0 and -1 are imho just perfect.
The tackling has not been downgraded, you still need the right timing to win over the ball. What has merely changed is that the players don't stumble so much like in the demo when wrongly tackled, they adjust and keep possession of the ball, therefore no need for the referree to whistle... which is imho better, in the demo the game was interrupted too often for slight tackles that in reality don't always justify a foul to be whistled.
More animations for the goalkeeper, better advantage-understanding for the referree and the jog-bug and greenzone-bug fixes are needed for the game to become perfect.
But as of now I'm very happy with the full game.