I'm not sure about melee carries either (they do great damage when they get to do damage) but fighters could use some buffs.
I think that when fighter is pretty lame because the best build is often fighter into full tank. I think that's pretty lame. The only champion that I feel can get away with going at least 2 items into tank is Riven because she really takes advantage of life steal.
Going 2 damage items on a lot of other fighters is death in teamfights, you need to go only one into tank if you want to survive.
I think we need another Jaurim's Fist item.
I think it sucks that most fighters can't kill super tanks at all late game.
I think it sucks that most fighters can beat tanks early but lose teamfights so hard. I think tanks should have more counter play.
However I also think that a lot of our fighter lane bullies also need more counter play. Shen and Sion are pretty bueno when I think about it, they're good tanks. Lane bullies like Renekton, Gnar, Jayce and Fiora (kinda) are lame. Gnar has range and Renekton's lane bully is point click stun into burst and dashing out, while Fiora pretends like she has counter play but doesn't unless you have insane mobility to protect vitals (Fiora should never miss a vital with her Q, it has great tracking).
I think Mao'Kai needs that acceleration change on his W. His a Warden but can play extremely well as a Vanguard because of his W. Imagine if Galio ult could be used everywhere, he'd have the same success rate as Mao'Kai. Vanguard tanks are favor in the meta but if you put a Warden into the middle of a fight they can still create a ton of havoc and tend to wreck more than Vanguards who focus on that one big engage. That's Mao'Kai.
Grevious wounds as a mechanic needs to be updated.
And of course, towers, dragon and baron need to be updated. I also think the reward for kills could be updated as well but this is kinda just balancing for LCS and how teams basically don't play for kills AT ALL sometimes because getting one solo kill doesn't do anything if you don't get an objective and doesn't give those champions enough of a lead (unless it's ADC or something).