Deified Data
Banned
Even Bells is a pain in the ass to finish. I got about 20 kills, did a calculation on how long it would take me to get to 100, and decided it wasn't worth it. And that one isn't even an issue of difficulty, it's just time investment.
It'll get patched, I'm sure. For DS1. they patched it so you could easily finish the covenants without doing any PvP.
Hope so, it's definitely #1 on my "to patch" list.