Let's compare: Why is Lee considered unfair while Amumu is not?
Amumu: Jungler. Powerful ganks. Initiates teamfights with a single target skillshot gapcloser and follows up with AOE damage and a potent cc ultimate that can win teamfights. The same general pattern as Lee Sin, and Amumu tends to boast a much higher overall winrate.
Here's a little guide for Riot as to why this little guy is generally considered okay by your players while Lee is consistently among the most hated champions in the game.
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An actual weak period. You know that Amumu is going to become a monster late game. That's why he has a glaring weakness early on you can capitalize on. Conversely, players feel that there is never a time where Lee Sin is vulnerable. Why?
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Safety. Amumu and Lee Sin both throw a Q.
Amumu goes in.
Lee sin has a several second window to consider, and even then may cancel immediately with a ward hop, and his ult is there as well for a disengage. Every element in Lee's kit he can use to make big plays he can use to prevent them as well.
- Rewards for Counterplay.
Amumu and Lee Sin miss a Q.
Amumu can do nothing-his long cooldowns mean that he has been outplayed for this fight.
Lee Sin can W+slow+R to accomplish the same thing then use his minute CD on Q to jump out to safety
There are so many redundant systems in lees kit to prevent Counterplay that there's almost no point in trying-you're not going to waste any resource or stop his "bigplays" from happening, you may as well just accept it.
champions who will remain unnamed.
, which allows for him to rather easily position for ult without needing his q. In fact, I'm surprised I don't see him more often since this item removes a large part of his weakness.