For me, the Halo stories falter when they try to follow more than one protagonist. When the stories veer away from Chief & Cortana, and instead focus on Arbiter, or Lock it loses momentum. Halo 4 I liked because it was very solidly on Chief & Cortana. I loved the cutscenes.
Halo 5 I had issues with any mission that had Locke as the POV. Same with any of the Halo 2/3 Arbiter missions. Not that Keith David isn't an amazing actor, but I never really cared for the non-Chef POV missions. I usually skip them as quick as possible.