The Exotic Weapon Bounty with crucible requirements are laughable. Not only are you forced to use one specific damage type, you are also forced to go massively positive every game with those weapons in order to get any progress in them. The death removing progress on the bounty encourages people to quit instead of continuing to play losing games, reducing the enjoyment of everyone else in the game. These steps are absurd when you can easily get an exotic just playing the crucible without the restrictions and doing poorly.
EDIT: Apparently you even lose progress if you die while the game is over and the score screen is being shown. That's absolutely retarded.
[spoiler]"Use Void Damage to defeat Guardians in the Crucible. Death will slow your progress." [/spoiler]
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Despite how much I hate having to do this to get my Thorn, I still think these bounties are awesome. They are really challenging so you feel like you've actually worked to get your reward. Except Invective. That was god damn easy :S