Has anyone used a hammock and NOT liked it? Why not?

Yep, there are even a few over on hammockforums.net. Why, you ask. Because there are quite a few DIY folks there that make all kinds of gear.

I can echo pretty much what everyone has already said. The weight is about the same for me. And like using ground shelters, it all depends on the weather as to how much of my kit I bring.
If it is summer and no rain expected, I might leave the tarp at home. OTOH, if it's going to be sunny and hot it's nice to have the tarp for shade. If I'm not going solo, we may share the one tarp. Here in the summer, I definitely have to have some type of bug net. Now that I have a Claytor, it's integrated into the hammock.
I don't like the Hennesy's. Something about crawling back into the womb.

Check out Ed Speer's site and also www dot imrisk dot com.

Both very good sites.