I have Roleplayed for nearly a decade in various places. My main issue with RP throughout the years is people having overly powerful characters and trying warp the plot to suit their Mary Sue type characters. I've experienced it many times and those types of actions have destroyed many RPs I've been apart of. I've also had a ton of situations where people bring in their personal conflicts with others into the RPs to act out against the other person. I've been on the receiving end of that and had to write my character out of stories many times because another person made it unbearable. 

Discord RPs were my main go to for years. I was able to have a 1x1 RP last many years over Discord. I think I prefer 1x1 settings, as most RPs I've been apart of died out with no conclusion. When there were conclusions with groups, it often felt rushed with tons of Drama and Conflict around it. Most group RPs I've been in ended due to personality conflicts and conflicting views on where the story should go.

I haven't been part of a Group RP for years now. I don't think I'd be willing to go through it again unless something really strikes my fancy.