I'm a big eBay fan. I've bought some large items (cars, trucks) and lots of small stuff on eBay. I've sold things on eBay. I love it.
Yet I think it's going to the dogs. It's dog slow, the interface hasn't changed in years, and the feedback mechanism, which was once innovative and world-changing, is many years old and has been gamed so badly as to be almost counter-useful. You can't rely on it, you can't give anyone negative feedback without retaliation, and the whole thing just seems not to work any more.
The last half dozen or so transactions I've done on eBay have all gone sour in one way or the other. They're all people gaming the system, misrepresenting things, shilling, you name it. It used to feel like an honest marketplace where real people bought and sold things. It feels now like a bazaar with sheisters and "merchants" trying to think of new ways of ripping me off. Some of them successfully. Subtly, but successfully.
I'm sad, because I love perusing the listings and wishing I could buy an old Dodge flatbed or three tractors from a guy in Saskatchewan. I just don't trust it any more. It's not the people on it I don't trust, though that's part of it. It's the site itself that I no longer trust. And that's a shame.