Mundo needs some love

He can't farm safely and loses lane the majority of time. Even with the buff returning HP on minion kills he's left under his tower. He's simply outclassed in this meta. Even if Mao, Rumble, Gnar, Hecarim, Irelia, Vladimir, Riven and Sion all got nerfed... he'd still get outclassed Top lane (the only position he can really play).

He has no mobility outside of his ult, even then most champions can still escape. He has no real peel or CC and can be ignored in teamfights (or just ignited). There aren't many items that work well for him leading to a one dimensional playing experience.

He's a champion with so many downsides and limitations and the justification for it is HE WAS GOOD IN SEASON 2 or his W + Sunfire can kill. He's bad in lane, bad in teamfights and only really gets going after level 11... the only reason I care is that he's fun.