The Twilight series, yup. For the same reasons as everybody else gave.
Do nonfiction books count? 'Cause Darwin's "Origin of Species" was one dry read, good gravy. Yes, I realize its importance, but it's really boring.
Jack Kerouac's On The Road. My husband is a huge Beat fan, so it really annoys him that I find that book way overrated.
Oh, and that reminds me... I recently finished Hunter S. Thompson's Fear and Loathing on the Campaign Trial- at hubby's request. Not very impressed, really. Gonzo journalism is just.. I dunno, it's irritating to me.