@Jarkes
How does a show get “ratings”, exactly?
By how many people watch the show.
For example: the Super Bowl. As far as I know, americans care so much about the rating, so to make it way more popular they decide to transmit it in other countries for free.
In the case of Sonic Boom, CN decided to air the show in a very limited schedule were most of the people is sleeping, so the ratings were super low. As far as I know from the how USA Cartoon Network works, everything that doesnt work in the channel it is send to Boomerand to die.
TTG is “popular” because CN “forcefully” transmits the show almost 24 hours per day, every day of the week, and messing up other shows to become popular too.