Deej,
I love the exotic weapon bounty idea. I do them whenever I get them if only for the energy (I scrap the duplicates). However, since I have now completed all of the bounties at least once and most twice, I'd like the opportunity to get weapons that are actually different. I think the best way to do this would be to offer a Legendary Bounty alongside the exotic bounties with difficulty relatively equal to Super Good Advice (sidenote: Please buff with Bad Juju and Thorn). It could always be the same bounty and you could have it just give us a random legendary weapon or a legendary engram. This would mean that I could get excited again when I see the Mentor Missives.