Trailers can be deceiving. I remember seeing the trailer for Ang Lee's "The Hulk" and those were clearly temp fx in the trailer. Most people figured that's what the entire movie would look like. Thank god it wasn't. Regardless of how you liked the movie, the fx were done pretty well in the final product.

The big monkey movie is certainly getting mixed reviews. Mostly on the extremes. Lots of "loved it" and "hated it"'s.