...because they more often than not feel like nothing deserving of a "Legendary" tag description.
I've lost track of how many consecutive Cryptarch packages have netted me only two blues, some glimmer and rep. Of course this started happening a lot more since engrams were patched.
However, the one that really chapped my ass was the Future War Cult package I received for rank 4. This "legendary" package gave me a strange coin, some glimmer and rep. Grinding the rank on these factions takes way too much time to get such a horrible reward.
-
I have to disagree it is way easy to level the 3 guilds only because you can do both vanguard and crucible bounties. However on your other point I agree you should get better rewards for leveling the guild you support