First reason: The ENTIRE story is predictable. Not a single good twist was dropped on me. It's a typical revenge story/slice of "super hero" life with some comedy mixed in. None of the episodes really left me wanting to watch more.
Second reason: Few of the characters actually left a lasting impression. Instead, there was some character development every few episodes for one character or another in particular, but nothing was too relevant to the plot when it did so. Instead, Tiger and Bunny (obviously) go through the most development, and slowly grow more and more boring.
Third reason: Action. In an anime about super heroes, you'd expect there to be more fighting, right? Well, not with this. Very few episodes actually had a memorable fight scene to draw in the viewer! Instead, everything (or most everything) was fixed after maybe 5-10 minutes max.
Fourth reason: The ending was sub-par. About half way through the series, some events happen and the story takes a shift in the wrong direction, which leads to the bad plot. It's a typical "happy ending" in a sense, but really leaves a couple strings untied. I feel that with 25 episodes, they they really could have done better.
