Games

Warframe is a bit similar to Destiny in that it's built around multiplayer, but most of the main content can be solo'd if you wanted. But that said, the Warframe community is still thriving, so it should be pretty easy to find a group to play with if you want to avoid the in-game matchmaking.

There are a few sections restricted to solo only, but it's not the default, the matchmaking is pretty quick for a random group and there's a variety of people always looking to form groups for different tasks. One word of warning, people move fast, until you get parkour down, you might just end up running from the start to end of a level if you join groups, they'll have completed the objectives and be waiting for you to extract.

Clans exist, and each have their own space station called a dojo that's customized by them (cost is based on size of the clan, as a solo I was able to build up and level a clan on my own).

You'll almost always end up doing missions with other people other than when you intentionally want to do certain tasks solo.

A lot of the game is built around guilds and player to player interactions.

PvP sucks and it's almost all PvE content vs Destiny though.