I think vanilla destiny was when the game was at its best! I will always miss #forever29 and the first queens wrath (though I was level 5 at the time :P)
I feel like the crucible was better then too, though it wasn't balanced, fusions and autos were the best weapons, now they are laughed at.
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The vanilla game just had a sense of magic, wonder and this strange [i]untouched/unpolished[/i] feel that really made the game great for new fireteams. I'll tell you, if you were around to run Vault of Glass as a 27 with a group of 6 that had never done it...it was an incredible experience. PvP was amazing too. People used guns for fun, not to fit the meta.