I agree with Zky.
There's nothing really wrong with AA modifiers like Irelia W, Aatrox W, Garen Q, Nasus Q etc, but stupid targeted shit has to go. I'm talking basically all of Pantheon, Irelia Q/E, GP Q, Malph Q, etc.
When one asks "Why is this champion left to rot?" it's because they have some old mechanic that makes playing against them really unfun. In the case for top lane, it's mostly targeted spells. GP left to rot because endless poke with Q, same with Malph. Darius and Garen left in the shitter (good, fuck these champs) because their point and click execute.
But then you have these champions that have no targeted spells, and as a result, excel in everything else like Riven/Lee/Yasuo/Zed.
Although TBH I would much rather go vs Lee/Yasuo over Garen or Darius.
IMO Cho'Gath is a well balanced champion. All of his spells are extremely powerful yet have meaningful counterplay/choices. Q can be dodged, you can run away from E, he chooses between ulting minions or people, etc. The "balanced" melees IMO are the kinds like Zac, Aatrox, Kha'Zix, Rengar (although his kit can be annoying at times), Singed, Nautilus, Skarner, Renek, Trundle, etc. I'm conflicted putting Olaf there simply because his E. Point and click true damage is stupid.