I have used PayPal for hundreds of transactions, both sending and receiving funds, a few issues here a there (less than you can count one one hand), and always resolved in a professional manner and I can add, in my favor.
It's the best way to receive funds without a FEE, just have the sender select the GIFT option, and you will not have to pay any fees on the receiving end.
It's one of the best ways to have FRAUD PROTECTION with ebay transactions, whenever I have purchased something on ebay, and received the item and if there was anything wrong with the item or it didn't match the description, PayPal has sent me a refund within 24 hours.
We don't have the benefit of the FULL story from the OP, meaning, there are usually two sides to every issue, and we don't know the FACTS are from PayPal's point of view. PayPal could be doing an investigation of the transaction and it could cause the delay, etc.
I used PayPal back before it was acquired by eBay for $1.5 billion, I and I can tell you, it has only gotten much better.
I will continue to use PayPal as me preferred method of transferring funds!