I can't believe it but I have to disagree with Denny and Vinnie, I have really enjoyed some single hop beers.
Tastes are subjective. There's no reason we should necessarily like the same beers. When I was at Beer Camp, Sierra Nevada had a variety of single hop beers on tap. I tried them all and found them all boring for my palate. But there were a lot of other people who loved them. There is no right or wrong...well, except that I'm right!