After 400 + hours in this game and also completing the raid every week from the start has lead me to believe this:
In the patch that made rahool more generous you [i]changed ascend material from rare to legendary.[/i] This is where I believe the raid drops are getting thrown off. Now whenever you roll a legendary drop in the raid it is almost always shards or energy. The first week in the gorgons chest two people in the group got exotic Monte Carlo. Every subsequent week whether on hard or normal yields shards, energies or the class item. Everyone got some useful and now it's disappointment as the only reward.
[b]TL;DR Now that ascendant materials are legendary everything else in the raid has a lower shot.[/b]
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Unfortunately thats not how the drops work. Its not all things legendary or over can drop. The raid has a specific loot pool that it pulls from at random. Chests and bosses have different pools. Now maaaaybe they messed with the percentages of getting exotics etc, but the changing of shards and energies to legendary shouldn't have any actual effect on what drops.