I'd may as well chime in before MM voraciously rips the original poster apart like a wildabeast going after a baby calf:
The notion that mordy is somehow "extremely hard to balance" is rather adorable, as there have been multiple suggestions on the matter (I'm in the camp that thinks his passive would be more balanced if it reset itself, a bit like the opposite of malz's current one in which if you don't use the shield after 30s-1min then it just "goes"). Rito has a habit of releasing stupidly hard to balance stuff (kalista, azir, malz, the aformentioned mordy, and soon to be new rengar), so surely they can do the opposite and fix one of their messes for a change
His spells also kinda have to have the damage they're at. Mordy's a melee juggernaut with zero cc (excluding rylai's) and zero gapclosers. If he doesn't do some kind of damage, then what does he really have going for him besides the whole "I look like the iron giant but don't want to kill all of humanity" feature.
Posting threads about stuff you don't care about as well instead of bringing about actual discussion is just, ugh. If I created a post for every thing I didn't care about, Rito would have 20,000 new topics and I'd probably get an emmy.