It's Craigslist, not a professional service, so you can hardly expect the same level of satisfaction that you'd have if you went to a professional service, such as a used car dealer. That said, you're also paying significantly less than you would at a lot, and, as with most things in life, you get what you pay for. Why complain about a free service? The people who use it probably aren't going to be the most professional people on the planet; if they were, they probably wouldn't be posting their cars on Craigslist.