Never were the best. Frozen was the only one (Up until season 7) that was BAD! The Queens of Darkness was good but it couldn't really be fantastic because of how rushed and cluttered it was (They should've skipped the Frozen story arc). Although, the Cruella De Vil episode was definitely the best of the season.

I never cared for the Frozen arc.

even though i loved the frozen characters more this arc was WAY better & more interesting IMO!<3

I keep forgetting what the plots of season 4 were. It's the least memorable season for me.

I felt the Queens of Darkness weren't well-used - they were either brief villains or negated into no longer being threats. I wasn't really a fan of how the whole "everyone has aspects of villains and heroes" theme was done.