I'm probably in the minority here, but I like all the films from this period. IM 3 I thought dealt nicely with Tony's PTSD after the events of New York even with the Mandarin fake out plot device. I liked Thor: The Dark World and Alan Taylor's direction. Loki gets some good development as well. Avengers: AOU was great and I loved James Spader as Ultron. I think this phase is underrated and doesn't get enough love compared to 1 and 3.