When we first got Herc, the buffs only lasted for 3/7 turns. In addition, her nuke would Dispel everything off of her, so if you wanted to use that, you'd at best get 2/7 turns with those buffs. The buffs themselves were always that good, though.

But after they buffed baseline Herc AND gave her that absolutely amazing Relic weapon, Herc became just stupid. One or the other would've been enough.