Legendary tasks are something that I, in general, take with a grain of salt:
I understand BOTH sides of the argument and depending on the day, agree with both. So, I will keep making my donations and keep collecting my rewards. But after the, gosh I don't even know how many Mean Machine has opened, to have NEVER received a Mythic and to HAVE received SOOOO many minor yellows, its beyond frustrating.
Guilds who HAVE received better rewards will certainly look at these tasks more fondly.
But the fact that they are GOOD rewards for the easiest attainable, refillable resource (GOLD) makes them worth it, no argument there.