Running the content once doesn't mean you've done everything.
This game is a grind especially if you are chasing after legendary's and high tf/wf items.
You have to do everything every week in order to have even remotely close to what you want.
I'm aware this isn't appealing but that is the game and you can't be sad that you got 2 legendary's regardless of them been bad/good as you do not really play the game that much either way to make use of all the superior legendary's after all.
So all in all you are whining for the sake of whining because its cool in these days of age.