I've had several hammocks, and have to say that they excel in the right conditions.
I will also say that the complaints of being cold, hammock being too short, uncomfortable, etc, CAN BE OVERCOME.
A Good hammock setup dialed for you and paired with the right top and bottom insulation will be comfortable, very fast to setup, and warm.
Unlike a tent you've got to think of insulation in a hammock in terms of top and bottom, not just a sleeping bag. I use an EE Rev X 20 degree top quilt paired with a hammock gear 20 degree underquilt and various pads as conditions dictate.
I'm tall and toss and turn all night, so I have a TTT Switchback. My wife is medium height and sleeps like a rock and she loves her Warbonnet blackbird.
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Ultralight Hunting Backpacks