Yeah, you probably just had a bad experience. Sometimes people only need certain parts and will leave once they get to one they don't need as well (someone who jumped in with a random group and only killed atheon, and now needs everything else from a different group). However matchmaking would be 10x worse than this, because you'd need 6 dedicated players that are willing to put down time and learn to play with eachother, be able to communicate, be a high enough level with good gear, etc. Let me put it this way, if the in game matchmaking service wasn't just as complex and advanced as destinylfg, it would fall flat on its head and i gauruntee that it would fail and just cause more hate for bungie. Are players on lfg always reliable? No, of course not. But they're WAY more reliable than a completely random player would be.