Best years: year 0 to year 2010 and year 2015-2016. When that abomination didn't exist.
The worst years oh HF: 2010-2014.
Nah, here are the years ranked story-wise:
1: IFB. There's something funny about these so-called "heroes" killing an entire race of innocent creatures and laughing about it.
3: Rise of the Cookies
4: Ordeal of the tired
5: Sad planet
6: Bran attack
Note that that's just a generalization. RotR had bad sets, like all of the heroes. SP and OoF had good sets, like WD and Fire Lawd.