Have you ever read a book where the main character was supposed to be smart (or even a genius), but all of his or her "brilliant plans" seem like something that anyone with half a brain (or a good working knowledge of action movies) could have thought up? I don't feel like naming any examples here, but I've read (and writte) many a review where the "smart" character comes across as anything but.
There are two ways to fix this:
1. Think up smarter plans. (Hint: If you saw something like it in a movie, you should probably try to be more original.)
2. Stop telling us how "brilliant" your characters are. Let your readers decide for themselves.