For the most part, the people I bought things from on that site were talented, professional, and kind people, However, the one time I had a problem with someone I was very disappointed by Etsy's ability to help at all.
I had ordered two custom made clothing items from a buyer who had originally contacted me asking about the sizes and such, which was normal.It took quite a bit and so I wrote back to them to ask if everything was going okay. This was last August, and they replied several weeks later to say they had a family emergency and that it would take a little while longer. After that I never heard from them again.
I had gotten notice that it shippped in December, but it didn't have a track number like any of my other orders, and it never came in.
I sent a complaint explaining what had happened to Etsy to ask for help, but they said after a certain amount of time after the order, there is nothing they can do. I went back to their feedback and noticed other people had been having that problem too.
So, basically, Etsy is a fine website as long as you're careful about who you order from, and don't expect any actual help from Etsy.