Check out
www.paypalsucks.com for some examples. The short answer is they frequently offer very little to no "protection" if theres a problem, they grab peoples money on a regular basis and wont let it go, and they're policies need some work.
As far as the credit card payments, I find a lot of buyers think they get credit card protection when they use them with ebay/paypal. They dont. Paypals job is to act as a payment clearing house, and most credit card companies wont pursue a "bad ebay deal" paid through paypal, as paypal DID do their job. Further, you agree to NOT file a credit card claim on a paypal transaction, and doing so may forfeit your account and its contents.
I had two fairly benign issues with them that were simply bad policy and inflexible bureacracy. I had a basic account...someone without the requisite 3rd grade reading ability tried to pay one of my ebay auctions by credit card, even though the auction says "no credit cards" for payment. Paypal offers to upgrade me for free to an account that takes a charge for a fee. Later I discover that they now assess fees on ALL transactions, not just the credit card ones, and I asked them to downgrade me back to a regular account...years go by...it happens again, and I figure "well, I'll upgrade, take the charge, pay the fee, and downgrade again". Well, no...apparently on page 379 of the "terms of service" they let you downgrade once, and only once. After that you're a full fee paying customer.
I didnt want to be a full fee paying customer. I'm a cheap bastard.
So now advised of the situation, I asked that they downgrade me as a courtesy, and I'd not upgrade again.
Nope.
Sooo...I said "If you dont, I simply wont use your service. So in essence, if you downgrade me, you'll continue to see revenues from my using your service to buy things...otherwise you'll see no money at all.". The response was that "no money at all" would be fine. So I asked them to delete my account and my financial information. Not the first time I've gotten the answer that "no money" was superior to "some money", nor the last.
Years go by....
It wasnt until I went to donate some money to Dory for this board, when the mechanism let me know that it was paypal and my credit card numbers were still on file with them. You know, the ones I asked them to delete. And I couldnt use the credit cards to donate without reactivating my paypal account. Fortunately Dory allows amazon payments, but I think they skim the heck out of them.
Turns out Paypal retains your credit card and bank account information INDEFINITELY, whether you're a customer any longer or not. I once again asked them to delete the information. Nope, according to page number 874 of the terms of service nobody reads, they can and will keep it. Forever.
I had just read the 30th "hacker steals credit cards from xxx web site" story of the month, and told them if they didnt delete my information, which was of no reasonable use, that I would close all the credit and bank accounts and reopen them under different account numbers, rendering the information no longer useful to them at all, and at considerable effort and inconveniece to myself. And assuring I would never, ever, ever be a paypal customer again.
"OK!" they said..."go ahead and do that...we wont delete your information!"
Three days later, none of it had any value to them. And I WILL follow up on my word. Money orders have worked just fine for me since, and although they're slightly more hassle...I dont have any worries about funny fees, lost financial information, or silly policies and bureacracies.