To be honest, even I think that's a bit harsh

How do we know the characters won't be portrayed as they are in the game, as long as the princess is pissy about working with prince, the villains some old jaffar ish dude, and the main elements of the game then I'm happy. (IE the dagger, sands of time, the hourglass, dagger powers etc)
The effect (which I'm assuming is the rewind move) seems pretty awesome, and there's only so much a trailor can say about a movie. If the trailor hypes the movie too much (as Pirates did) then of course it's gonna suck when it comes out, only to the fact it didn't stack up to the hype. That doesn't automatically make it a bad movie.
I'm sure it'd be different if it were something like sayyyy Naruto or Innuyasha, or some other majorly huge anime. But for a game that has basically no story (find the hourglass whoopie) and considering this IS disney, it's gonna be a little off.