I'll agree Teen Titans is overrated. Good show, but not THAT good.
Spongebob - it's kinda of just dumb.
Invader Zim - it's okay.
Tom & Jerry - Like Roadrunner cartoons...except boring.
Southpark - When it's good, it's REALLY good....but most of the time it's actually just annoying.
Family Guy - Fairly good across the board, and occasionally really great, but still nowhere near as good as people seem to think.
The Simpsons - Good, but just waaaaaaaaaaaaaaaaaaaaaaaaaaay beyond its expiration date. It's just pointless now.
Transformers (kinda all of them) - I fucking LOVE Transformers (in the sense of characters, concepts, designs, story, etc) but the shows have never lived up to their potential.
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Avatar:The Legend Of Korra - NOT overrated. The first season had room to be a LOT better if Amon's identity was different, but (disregarding that I had come up with a far better conclusion) it was nonetheless FANTASTIC. It is COMPLETELY on track to be better than The Legend Of Aang in the coming seasons. The Last Airbender wasn't at its best in the first season either.
Young Justice - A hell of a lot better than every other DC cartoon ever made that wasn't part of the DCAU, and actually much better than MOST of the DCAU. Young Justice is outright one of the best superhero cartoons ever made.
Ultimate Spider-Man - It's actually a really good show. You just have to accept that it's the first cartoon to take on Spider-Man as an impetuous teenager (more self-obsessed and focused on having fun) than the more serious and responsible versions of Spider-Man from Spider-Man TAS, Spectactular Spider-Man, Spider-Man TNAS, Spider-Man Unlimited, etc, etc.
He hasn't yet learned to be a responsible hero, and the full weight of what his responsibilities actually are haven't fully settled in his mind yet.
He's getting there though....slowly.
My Little Pony:Friendship Is Magic - It's not overrated. It really is a GREAT show. BUT...it's simply not for everyone, as a lot of the most avid fans would like to believe.
I love the show, but I recognize that it simply doesn't mesh with some people.