Similar thing happened in Phase 2. People thought Alan Taylor from Game of Thrones would knock Thor 2 out of the park and thought the Russos, directors of You Me and Dupree, would **** the bed with Winter Soldier. Turned out to be the complete opposite.
People fail to consider what working in the Disney system and the big studio system can do to a director. Some directors can thrive in the big studio system making massive blockbusters. Some directors end up floundering or drowning entirely. Taylor was a director that drowned in the big studio system. The Russos on the other hand thrived at Marvel and benefited greatly from Fiege and Disney watching over them.