Destiny's Vault of Glass raid is considered to be the best the game has to offer, a departure from the normal gameplay mechanics into something much more challenging and rewarding. To complete it, though, you need a high-level team of six, and there's no randomized matchmaking to support those looking for a group.
Bungie mentioned in a blog post that it would be discussing the addition of raid matchmaking in the future given community feedback, but there has been no further mention since. While I suspect the team will add it eventually, there are plenty of players left out there who have yet to experience The Vault of Glass because of the difficulty in getting a high-level team together.
It remains to be seen when or if this update is coming, but there are some alternatives in the meanwhile. You can organize a group online, assuring you find like-minded and dedicated fireteam members if you can't assemble enough friends. Places such as Reddit, the Bungie forums, and two different "looking for group" sites can help you find the fireteam you need. Random matchmaking may very well be on the way, but finding these hardcore dedicated players online actively seeking a squad might be the next best thing behind playing with people you know.
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Matchmaking would not, it must be said, be a perfect solution. Bungie chose not to include it because a randomly compiled squad would lack the planning and teamwork required to succeed. This is probably true, for the most part--a group of coordinated friends who communicate well will undoubtedly be more effective. But fans are resourceful, and the results might be very surprising. This is especially possible considering that the mysteries of the raid have been solved and posted online, many players know what they need to do, and a dedicated party could definitely succeed. If you are in need of a group and can't get enough friends together, try any of the sites above--you might end up having no need or desire for matchmaking.
