I'm primarily a PvE player and mostly a solo one. I also have no great love for PvP, but I have to say that the completion of the Crucible quest line has been the most satisfying thing I have completed in my nearly 3000 hours of Destiny. Before doing that quest I had only ever played control so it was definitely out of my comfort zone, but I am a better player because of it. I don't even do the weekly bounties, but the satisfaction of overcoming a seemingly insurmountable task was reward enough.