Absolutely! A few things that really struck a bad chord with me:
2) increase Mundo’s gameplay variance beyond landing cleavers
The only time cleavers are my focus are when my laning opponent will almost certainly kill me for getting in range--especially early game. A lot of my plays come from Masochism and outlasting my opponent. Canceling my auto-attack on the E is absolutely crucial in many cases.
It's why a lot of Mundo mains will take Approach Velocity in their second tree, and I see the recent buffs to the rune being particularly huge for him.
That's a bit beside the point, but the cleavers are merely something I use to get in range. Right now, he's working very nicely as an anti-AP bruiser. Not so much when he has to duel "real" bruisers, especially before level 11/Rank 2 ult.
Then, the approach to lore really bothered me. I've always liked this idea of a doctor who over-experimented on himself and fried his own brain. The knowledge is still there and fragmented--which is why he's so good at picking apart his victims. The mutated doctor thing is also a callback to his beta design, when he was a real doctor. It kinda burns that legacy to change it.
I agree that a "flat out dumb" character is an interesting idea, but not for Mundo. It really bothered me when it was alluded to in the short story from a few years back that he wasn't really a doctor, and it's bothering me that is the direction that he's being pushed again. I like his association with Singed and by extension Warwick. It would make sense that they are all involved.
I could elaborate more with gameplay examples in terms of his current drawback and balances, but I've already written a small novel by reddit standards.
Oh and for the record, I like Concept #I the most, a big upper body and tiny little stubby legs. Maybe a bit more lab coat though.
I will do anything I need to help make this a success. I'm terrified that Mundo will be replaced by an imposter I won't be able to play anymore.
Edit: grammars