http://mylolface.com/assets/faces/angry-must-resist.jpg
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are fucking op tanks man! Tanks are such bullshit, no skill champs! Nerf tanks!
Those aren't tanks! They are juggernauts! Stop making me hate a subclass I should like because of your misunderstanding of what a tank is!
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shouldn't be nerfed because of or some tanky damage dealers.
/rant.
You are right, tanks are op. 
A streamer is playing Gangplank versus Illaoi toplane. Illaoi Grabs his soul, ults for the 2 tentacles and W's to get 4 tentacles to smash down on GP and his soul Gangplank is at half health, but simply walks away from Illaoi and lives Twitch chat: ''OMFG SO BROKEN WTF?!?!?!??!'' ''ILLAOI BALANCED LUL'' Me ''So we're just going to ignore the fact that he lived by simply walking away?'' Twitch chat: ''WTF?!?! RITO??!?'' ''RITO FIRE UR BALANCE TEAM EleGiggle'' sighs
Juggernauts are not Tanks. They typically build tanky but don't have the same hard CC, engage potential or defensive steroids of a tank.
Nautilus has a shield slow, grab, stun on passive and an ult knock up that can not be blocked. He can hard engage a lock down an entire team potentially but he can't 1v1 very well let alone 1v2 or higher.
Darius has short rang pull and a mediocre slow. He will build tanky and potentially do terrific damage but he has to rely on his team to get him in close or else he will be peeled and obliterated. He has no hard engage outside of flash.
People always make this QQ forum about Nasus as well. QQ nerf Nasus! A tank shouldn't be so tanky and do this much damage. Again not a bloody tank!
Nasus has one, albeit strong, targeted CC ability. So he can shut down one enemy's movement and AS. He does terrific damage with his infinite damage scaling Siphoning Strike while building tanky However, again, he has no hard engage and is extremely dependent on his team to get him inside to do his damage.
Juggernauts are slow plodding dealers of death and if you are stupid enough to engage in melee range with them and they are ahead and well farmed then you are going to die.
Tanks are iron giants who can close the distance and hold down the enemy so their team can clean up but deal arbitrary damage.
I'll just leave this here for anyone who is confused as to what's a tank vs what's a juggernaut (or any other class for that matter):
http://boards.na.leagueoflegends.com/en/c/developer-corner/3A5uuBw7-champion-subclass-list
Anytime someone is confused to what a champs subclass is , feel free to refer to this to correct them :p
Here is a list of every melee champion and what group I think they belong in.
Juggernaut - easy to kite, lots of health, deal high damage
Tank - tons of cc, hard to kill, scale off of defensive stats or have defense built into kit
Fighter - can engage themselves, deal good damage, not as tanky as above categories unless building for it
Assassin - high damage, low defense, highly mobile
Other - oddballs not fitting any of the above or multiple of the above
Feel free to let me know if I missed any or if you think any should be in a different category.
To be fair, Amumu might as well be a Juggernaut himself, he deals a lot of damage, even more if he gets an Abyssal or Liandry's in his build.
http://mylolface.com/assets/faces/angry-must-resist.jpg
Those aren't tanks! They are juggernauts! Stop making me hate a subclass I should like because of your misunderstanding of what a tank is!
/rant.
Juggernaut is subclass of tanks..
