I can agree with you this.
I can't stand some of these shows. I like Annoying Orange. It's ok. But stuff like Adventure Time and The Amazing World of Gumball is just plain weird.
I started watching just because it was on at a convenient time for me to watch... it seemed like simple wacky crap to mindlessly watch... but as time went on I found myself getting emotionally invested in the characters and by the time we got to episodes like the 3 parter "The Lich - Jake the Dog - Finn the Human" I found myself awwed by how intense and great the show can get when it takes itself seriously and actually sets the wacky crap aside to bring its more serious and emotional undertones to the surface... and then "I Remember You" and its continuation "Simon and Marcy" aired... I not only was I emotionally floored by both episodes but those 2 episodes took the character I hated the most (Ice King) and turned him into my favorite character.
So yeah, at first I did not get the hype but as time passed the show managed to show me some merit.