I play mostly solo, and have to say that aside from the mess that is Competitive Ranking (Glory), and a few bad Heroic strikes I've been fine as a solo player. Done pretty much everything I'd expect to be able to do solo, and even had some random invites to group up for EP on Mars. After finishing my weekly milestones on all three characters I've been working on the Exotic quests for Sleeper, Sword, and Scout. Working on catalysts. And enjoying trying out some of the new exotics in quickplay for the Valor grind. I still have a lot of friends who Raid but I find the D2 raids to be kind of boring and rewards still aren't worth it for some ugly reskinned armor and a bump to light level so I'm happy to avoid them, and don't feel like I'm missing out. Same with Trials. My only real complaint is the Glory climb as a solo player, because I want the Claymore, but I'm not going to spend the 500+ hours I'm sure it would take to get it as an average solo PvP'er. I know things will become stagnant again in a couple weeks and I'll go back to other games until the Fall update, but for the moment I'm having a decent time playing solo.