Depending on what I use Ebay for my experiences vary wildly.
First, the good: the site is fairly easy to use, you can set up an ad and sell your unwanted stuff or take it a step further. It used to be a bit easier before they set their ridiculous standard of 500 pix minimum for pictures (yes, I like clear photos, but zooming in a tad further on some would get you more info). If an ad has a bad photo you can always ask to clarify. With a standard, unpaid account you get 50 listings free (auction or buy it now) which is nice.
The bad: Yes, there are some scammer out there on both sides of the spectrum (I buy and sell there myself, so I have seen both). I strongly suspect the site has an algorithm working for it as well; if it suspects it can sell you something say goodbye to ever getting any 'extra' free ad space. I keep my buying separate from my selling (allowed) and I get free listing offers on my buying account all the time which are never mirrored on my selling account (which I don't use). And I do mean NEVER.
The ugly: customer service. Good God, the customer service. As a seller, no matter what the issue, just save yourself the aggravation and don't call them unless you have a couple of hours to spare and are prepared to take it to the top. The 'seller protection' means nothing, that's just a marketing trick. Don't fall for the 'we'll call you back' either; believe me, they won't and you will have to start all over again. Honestly... there is no service there. Over the years i have used Ebay I have gotten so aggravated with this part of it that if a viable competitor were to arrive (and no, it's not you Shopify) I would jump without question.