Dr. Mundo is getting a visual update on his particle effects and that's great. His ultimate and W are now readable, and the skin specific effects bring some value to older skins. However, why does hitting an enemy with a cleaver, axe, or baseball bat wrapped in barbwire no longer cause a blood effect? The only skin to still have it is drastically reduced to the point of being unnoticeable. Who are you trying to satisfy with this Riot? Is this Grave's cigar all over again?
It's understandable to make these changes for some of his skins seeing as he's not wielding a sharp implement, but the change significantly harms his core identity for the others. The charm of Mundo is the goofy riff on a slasher film character. He slobbers and guffaws while burying rusty steel into his foes' flesh. Instead, we're left with power ranger effects that give no impact and personality to the Doctor.