I want to see what the community thinks as far as matchmaking goes.
Personally, I would like to see all matchmaking be optional and have optional matchmaking added to raids, nightfall, weekly, and daily. The way I see it, I should be able to run a strike solo if I would like to, instead of carrying randoms through it. I should also be able to quickly find random people to play the nightfall, weekly, and daily without having to go to the forums. I don't need to build a custom fireteam for those things. As for the raids, I think there should OPTIONAL matchmaking. I don't think I would use it much (I prefer to play with groups I know. Much higher success rate.), BUT I can see how matchmaking would be nice for rookie raiders. It can be hard to find a group willing to take a few inexperienced players through a raid. It would also be nice for the situations when you are able to put together a custom fireteam of 4 or 5 players, but you'd like to quickly pick up one or two more players.
TL;DR
If matchmaking was added to raids, nightfall, weekly, and daily, and ALL matchmaking was made optional, I believe Destiny would be better for it.