User blog comment:Derp2000/Matchmaking in Weekly?/@comment-25876510-20150225070608

Personally, the challenge that comes with going solo on the Weekly Heroic should be one to be taken. They often aren't too hard (barring damn Devil's Lair with Arc Burn and Nexus with Void Burn), but become much easier if you are in a group.

Nightfalls, this would be an excellent decision. Yes, one can solo them, Yes, one might have the talent to do it perfect. But when you have to start all over again from the beginning due to just one slip-up, it's awful.

Raid, you really need coordination and communication to complete them. It's understandable as to why Raid has no matchmaking, because the whole fireteam has to work together to complete it.