Not awful. I’ve had only positive experiences. No buyer protections, but it’s hard to get scammed buying something in person from someone local, unless you get it home before realizing it’s fake/broken, or they kidnap you and lock you in their basement. There are pretty simple precautions you can take against either, not that there’s any foolproof solution…but I wouldn’t say awful.
As someone outside the U.S., what is your default persona for anonymous/pseudonymous users until you know more about them? Just curious. Like, if you don’t have any information about them, do you read the words in the voice of a person just like you?