I got into it rather late since there's only 2 episodes left, but Tiger & Bunny is actually really
good. It's superheroes (American style superheroes, not Super Sentai heroes) in a city that's a stand-in for New York. The animation is top notch, and the action sequences are suitably flashy. There's that mix of animation and CG that I always dislike, but it's used well enough that I got used to it fast.
More importantly, the writing is gold. The setting of all the heroes participating in a tv show like Cops, but where they receive points and are ranked, was a turn off at first since it made their motivations seem shallow to me, but it is actually handled quite well. The witty banter between the characters reminds me a lot of the old Justice League Europe/International books. Finally, the plot lines are a constant escalation of shit going bad. It also doesn't hurt that the villain for the first twelve episodes is basically
a combination of Magneto and the Joker.