Galio has nearly 70% win rate in ARAM

Think the spell might need a bit of retuning? At least maybe a more meaningful cooldown?

Perhaps it was designed to give melee classes a chance in ARAM, but more often than not it just switches the decisive advantage to the team with the most CC tanks. Tanks like already have gap closers, they are balanced around the idea that they can close on a squishy target at the cost of a cooldown. With though, they can instantly be on top of a squishy without spending any cooldowns, and stick to him forever, beating him to death with a bunch of defensive stats instead of mechanics.

To anyone thinking of saying "the game isnt balanced around ARAM" or "who cares about aram?"

Simple fact is, Riot created a considerable amount of original content and lore specifically for ARAM, and plenty of people play nothing but ARAM. The fact that the mark spell exists shows an attempt to balance the game mode. Only problem is it just gives other specific champs and builds a significant and unfair advantage instead of balancing the viability of melee classes in general.