Bungie isn't sitting there at there computers purposely giving you shards or energies. It's called a Random Number Generator.
Notice the word [b]random[/b] in there.
So just because you've been playing for a long time that doesn't mean you're guaranteed a Gjallarhorn. It's all random. It's not Bungie's fault, so stop complaining to them. End of story.
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They are the ones who made it run off a Random Number Generator. They could have used a different loot system is what people are saying.