garens first iteration was shit.
imagine adc slowing themselves when they auto attack someone. or darius slowing himself when he hits someone with his q. thats literally how fucked up the self slow on his spin was.
what made the difference was that there were a lot of changes that followed after the initial teaser, that made him actually strong. instead of the self slow he deals 25% less damage to multiple targets. which means he actually speeds up by spinning on a creepwave and champions, with a cleaver now. instead of slowing himself down, he gains ability to stick once hes in melee.
this is a difference like night and day.
they also changed his w to be able to be fully stacked with 1 point put into it. previously the resistance cap was limited by rank. which means you usually had to deal with 10 bonus resistance on the w instead of 20% until lategame, since the w is usually maxed last.
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Well, on PBE, pople said skarner is up. Lookat him now. Biggest win rate in history of LoL. Oh, and Darius get's buff next patch. +20 DMG on Q on all ranks, and increased attack speed
much like garen, skarner also got a bunch of changes from the moment of his first teaser.
its not wrong that darius was probably the strongest rework at the moment they officially teased the juggernaut update.