balance

How is half the champions of the league balaned like nasus tryndamere annie akali all of them are so much overpowered riot said that they want tanks to 'tank' in the team fights but now maokai goes full tank and assasinates the midlaner the adc etc i dont know anymore this game is not balanced it is the exactly opposite of it. Do you think i am right ? tell me in the comments thank you for reading!