Fizz and Lee Sin have no reprecussion for being bad

Fizz, and Lee Sin both have enormous mobility, and usually decent damage (In Fizz's case monumental damage). Why should Fizz, or Lee Sin, being as powerful duelist, and team fighters as they are be able to escape so many well coordinated ganks and attacks on them? Lee Sin has massive health, CC, and control going for him, Fizz has absolutely gamebreaking damage, and enormous teamfight potential, and yet both heroes also have the ability to avoid danger better than most other heroes in League.

I don't want to hear talk about "skill" making them that way. After a thousand games, if you can't effectively play Lee Sin, or time your jump on Fizz, well then there is something terribly wrong with you. They have too much potential, compared to other heroes like Akali, with only a mere engaging ult that usually gets her killed if she doesn't use it right.