Disagree. Recently made the switch to a Hennessey Hammock, used it on the Victoria Day weekend in Algonquin in lieu of my tent, or sleeping under a tarp. I have a Bivy/Thermarest/Sleeping Bag set up. The Thermarest provides insulation from your back freezing out. Best sleep I have ever had in the back country. Take a a little customizing to get the right amount of sag on the hammock, but I don't know that I will ever go back. I did switch out the stock fly that comes with it, and replaced it with a MEC scout silnylon tarp, rigged on an angle asymmetrically, and that provides a bit more protection should inclement weather roll in. Even with that, it packs much easier than a tent, and I picked up the snakeskin, which make packing up and deploying super quick, and protect the sleeping area from getting wet when setting up or tearing down in the rain. Going to get a set for my separate fly/tarp as well.
Seriously thinking about ditching my tent altogether. The drawbacks are: 1 - I felt a little more vulnerable, as in a tent or under a tarp, I slept with my axe beside my head in case of bear encounter. Can't really pull that off in a hammock. 2 - my friend is a stomach sleeper, and he had some difficulty adjusting to the hammock. But after a few trips, and some time spent at home adjusting his set up, he is all good. I am a side%2