Overrated, uncomfortable, unsatisfying pains in the ass.
2. Red velvet cake.
It's just chocolate cake with red food coloring. I'll lose some respect for you if I hear you say it's your favorite.
In the words of @KerriLendo: It "just isn't even that good." I've only ever had adequate or terrible lasagna.
5. Body Mass Index (BMI).
"Top 10 Reasons Why the BMI is Bogus" (NPR.com)
6. White Chocolate.
It doesn't taste like anything.
7. Eating breadsticks made with pizza dough as a side dish with pizza.