Breather Episode: The second half of the arc, which is just about the settlement on the lake, and with the exception of the badger attack and final confrontation of Hawkfrost, this part is generally far lighter than Midnight, Moonrise, or Dawn
Darker and Edgier: The first half of the arc, which is focused on a complete destruction of the forest, Graystripe being kidnapped, starvation, and poisonings, and the struggles of migration. Makes the events of the original series look light in comparison.
It Was His Sled: Hawkfrost is Tigerstar's son, Mothwing is an atheist, Tigerstar comes back, and the forest is destroyed.
Seasonal Rot: The second half of the series, which is arguably considered nowhere near as well written as the first half. Word of God (Vicky) has even stated Sunset was one of the worst quality ones.