If you're not impressed with the Demo version, that's ok and people here should learn to accept that. You stated that you will give the final version a shot before passing judgement on the game, so I see nothing wrong with your opinion thus far.
I wasn't overly impressed with last year's version at first, but the gameplay did grow on me in time and that's why I will purchase this year's version. It seems they have addressed the major flaws(jumpimg jack DB's, no sacks, super tackles, ability to steer RB like a car around pylons, and supermen QB's who could shrug off 300 pound linemen without much effort).
To each his own, every title has something to offer to each individual. Fever has XSN which will no doubt increase the game's popularity, Madden has a deep Owner's Mode which will keep their faithful happy, and ESPN has apparently corrected the flaws above which will make their gameplay even that much better.
For me, I enjoy the gamplay aspect more than anything else.
peace