whats crazy is i dont think mundo or tank masterys needs a nerf
i think his numbers and juggernaught status is totally fine
mundo is a juggernaught. like darius or garen. both of them are low cc high damage high tank
if i would nerf one thing on mundo. if he needed to be nerfed to balance sake
i would take mundos cleaver and make it slow 20% for 1.5 seconds at max rank (and all ranks seems fine too). thats a big nerf to mundos cc, but he keeps all his damage / tankyness / juggernaughtness
this nerf would also nerf jungle mundos ganks. which some people think are pretty strong right now with cleavers
EDIT: please riot i hope u dont nerf mundos numbers. i think the problem is easy to see
mundos winrate is high because games dont go past 20 minutes in this snowball preseason
and mundo is probably the strongest champion at 15-20 minutes in the game
but when everyone has full builds mundo is probably the weakest champion in the game. dying in seconds to full damage carries while doing not much damage / CC himself
a tank zac or maokai toplane would be way better lategame than a tank mundo in 6 item teams
if you nerf mundo only nerf the slow on his cleavers. thats it thats the maximum that should be done. nerf his ganks and thats it. his numbers are fine also grev wounds is way easier to get for adc's for 800gold