I avoid using PayPal internationally because they make it hard for me to pay in foreign currency denominations (they "helpfully" insist on being my exchange) but I have used it, it was no "worse" really than paying domestically. What makes them bad for you for international?
I argue it's not convenient for IRC tipping simply because 1) software is not well-integrated for minimal clicks 2) the other person might not have PayPal.
Don't get me wrong, I don't love PayPal, but I don't think Bitcoin brings anything really fundamentally important & new to the table, except maybe the decentralized part. Though, I suppose you could argue the decentralized nature of email was key for its universal adoption today.