Let's see:
Futurama: It's Great and hilarious, but kind of old and some of the newer episodes are hit and miss. Still the characters dynamics and geek humor is the best.
My Little Pony: Pretty decent, some bronies are awful. The plots are somewhat cliched or predictable and the humor can fall very flat sometimes.
Gravity Falls: Haven't watched it, looks cool.
The Legend of Korra: Not even Dante Basco could save that horrendous last episode. Nice continuity and has one of the best villains in animation in Amon.
Archer: Haven't watched it, looks cool.
Adventure Time: The best in my opinion. Reminds me of the old CN shows, every episode is memorable and you never know what to expect. Doesn't talk down to the audience like I feel My Little Pony does sometimes. Also great use of minimalism, gross out close ups and color values.
Phineas and Ferb: Pretty decent, though I hate shows with constant songs, also applies to My Little Pony.
Other: ...