Still need to get to the other seasons, but the first season of Infinity Train is almost the perfect response/counterpart to the last show I watched.

The main character is lost somewhere unknown, [b]and actually acts like she wants to get somewhere fast.[/b] The show does its dark and playful scenes far better. (And the character hates singing songs in cartoons as much as I do.) 

Plus, almost all the jokes are dogs are cute and morbid humor. Both things which I'm a sucker for. So yeah, it was pretty entertaining/well-animated. (Now I'm just waiting for them to fuck things up.)
[hr]
If I could give my original two cents on Korra. I honestly didn't find the first season all that bad on my first uncritical viewing. (Maybe a 6/10.) Liked the bad guy in concept, and didn't care that much about the anti-climax ending that bothered others more.

But the 2nd season turned me off so fast. And I wouldn't even be able to tell you exactly why. But watching glimpses of episodes throughout while my friend/roommate watched it. I think I'd hate it for the same reason I found Digimon Frontier so insufferable to watch.

1. BAD, like VERY BAD, comedy.
2. The lead is a mary sue/stew character.
3. Your hero [b]still[/b] loses every goddamn fight. 

You know, most people like characters having to train, then overcome their battles. But if you're going to be "I'M THE AVATAR AND YOU HAFFTA DEAL WITH IT." or "Friendship. Friendship! Friieendshiip!" And be unlikeable as sin every episode, [b]you could at least[/b] outsmart your opponents and win some battles on your own maybe. <.<'

(Don't know if its even fully accurate to Korra. But every time I looked at the screen, it was either (A.) A god awful joke. (B.) Korra being unlikeable. (C.) Korra failing.