It was also commercially successful , garnering 5.6 million viewers on its best-rated showing and receiving high ratings in the Nicktoons lineup , even outside its 6 - to 11-year-old demographic .
Avatar : The Last Airbender was popular with both audiences and critics , garnering 5.6 million viewers on its best-rated showing and receiving high ratings in the Nicktoons lineup , even outside its 6-11-year-old demographic .