naruto is much stronger then lee in taijutsu, unless you think lee can beat km or bm naruto in a fistfight (he can't)
naruto using clones makes him work even harder per unit time. so in 1 second naruto can work as hard as lee does in 1 minute. that makes naruto a genius of hard work, because he can outwork lee so easily. narutos 'traits' are mostly disadvantages as well, kurama reduces chakra control and uzumaki normally can't even use ninjutsu... so naruto surpassed lee at working hard and that's why naruto is more op then lee. same for sasuke.
If lee worked so hard then why is he so weak? madara worked very hard, hashirama worked very hard, nagato worked very hard, bee worked very hard, gai worked very hard, shisui worked very hard, itachi worked very hard, hiruzen worked very hard. all these people worked way harder then lee and thats why they are stronger. you can't just blame lees parents, if he had worked hard he could easily be stronger then any of the characters I mentioned.... yet he isn't for some reason.