I love it as well because it is not about selling new stuff that is wasting resources. When I use it, I feel like it is about getting stuff into the hands of people who need or want it rather than have it sitting around doing nothing.
Last year, I had half a pallet of concrete sitting in my garage that my mother had obtained for free after she had completed a job. It was masonry concrete and it sat there for a year. I checked with my mom about it and she had completely forgotten about it and had no use for it.
I put it on Craigslist free to anyone who wanted to come and get it. It was gone in two days and the guy that came and got it was extremely excited about getting it because he was remodeling his house and had no money. I felt good, he got the concrete and the garage had more space.
Conversely, EBay has gotten completely out of control. Everything is WAY overpriced because people are not trying to minimize clutter and get rid of stuff, they are trying to get rich off their bullshit crap they have laying around and they are hoping that someone is sitting out there just dying to spend $500 on some piece of crap doll they've had for 15 years.
I bought my kid of full kid's drum set for like $10 off Craigslist.