I think the problem is that Disney's marketing seems to be at odds with the filmmakers. Did the trailers for The Little Mermaid or Beauty and the Beast have all the funny moments quickly cut together to portray the film as something different than what it was? No. Most of the post-The Emperor's New Groove Disney movies did.
This is what makes me worried about Rapunzel, er... Tangled. Judging from the leaked trailer, does this really even sound like the same movie from when it was originally announced?