You expect it to give you great rewards when you took NINE HOURS to complete it? That's like coming last in a race and getting mad because you didn't get a medal. Ok, enough of the rant. The reason the people that joined in got mythoclast is because they weren't in the activity as long. Rewards are pretty much based off time. Which makes sense. The better you are, the faster you'll complete an activity, the better the reward you get. People figured out a while back though that this can be worked around as all you have to do is come in late, do a little damage, and tada a new exotic.