I remember a clanmate invited me to raid with him and his one friend and I think 3 randoms. We did the Atheon fight and it was a mess; no one other than me or the clanmate would call out left/right (or Venus/Mars or whatever you prefer), so if one of us didn't teleport than we didn't know which portal to open. I hung around in there a lot longer than I should have because I didn't want to bail on him, but it was a big waste of time and I knew it. Whenever people complain about not being able to raid because of no matchmaking, I think "Wait until you try it with 5 random guys". At the same time I don't see an issue with adding matchmaking to the Weekly and Nightfall...that might require a bit of teamwork but not nearly at the same level of coordination. Basically "I am dead, come revive me, thanks."