Regarding criticism 2, you have to opt-in. Otherwise brave is just a browser with adblocking capabilities built-in.
I don't understand criticism 3, but then again I have just been using Brave without opting-in to the BAT portion so I'm out of the loop on that.
Regarding 4, why would Paypal be the best choice? Paypal has shown they will close your account and confiscate your money pretty much at their whim. Using a non-BTC/Ether crypto token at least means your Brave wallet isn't a big fat target for crypto thieves.
I think the success of patreon et al have shown that people in fact are perfectly willing to pay content creators, they just hate ads.