If there is any one failing of the MCU, it's that Phase 2 is now over and they've *still* hardly even begun to setup The Infinity War and Thanos, particularly with regard to the stones. Outside of a couple post credits cameos, his only real screen appearances are two tiny scenes in Guardians; one of which we see him kinda act like a boss for a moment, and in the next the jobber villain of the movie FaceTimes him to sell out to his ass and tell him he's jacking the stone and he can't do shit about it. Then the Dark World post credits scene that two shouldn't be stored in the same place. Other than that there's the blink and you'll miss it Thor vision in AoU that sort of finally sets up the Infinity Stones, which is kinda the only real setup for what's to come. What they've done is a kind of wink to comic fans in the know, but for general audiences this stuff probably should have taken a more prominent role, especially in Phase 2; it certainly would have led to a more cohesive long form story arc. I'm not even expecting that to change with CW, so it may even take until Ragnarok for the ball to get rolling. What they've done isn't bad, but it could've been handled better.