Even though it's a commonly known fact, one of the main things I love in the Haruhi series, which I forgot to go through in my blog posts, was the spectator's viewpoint of the series. The fact that the series has multiple layers in the story, and we're presented with only one, yet the other ones still actively exist.
For example. Most of the first season/novel is just Haruhi trying to get friends and playing around with them with the excuse of finding abnormalities. But what we saw was that the abnormalities exist, she just doesn't know it. We're also given the theory that she really is an omnipotent being, even though Kyon never sees her as such. He aknowledges the her dangerousness, but it has nothing to do with her godhood. She's just a super-eccentric girl in the eyes of Kyon, even though it's almost never said.
In the later novels, Haruhi's obvious crush that flies straight over Kyon's head gets more and more important. Especially in the Surprise trilogy. The fact that Kyon doesn't get it during the whole show is kind of unrealistic, as the threads are kind of obvious, but the point is: He doesn't want her to like him, thus he blocks the very idea of it. It gets frustrating when it's poked at every second paragraph, but his eventual understanding of it will be all the more pleasing.
Anyway, the fact that the story we're told is just a fraction of everything that has happened, and the chosen main character who's just a bystander most of the time is an awesome way to bring plot elements greater than man to the story. By making our main character a normal guy in an insane world, the feeling of alienation and all the twists that we don't even properly understand are all the more satisfying. When things are explained farther down the line, connecting the dots between the past and the now is a feeling I rarely get from novels. Even though twists may come and go, the real twist is usually intertwined with the story and makes it's impact more meaningful at the moment it happens, where as here, the fact that the twist WAS intertwined with the story, but it was explained only later, made connecting the points and relying on your memory all the more engaging, because understanding the twist is more important here than just surprising the reader. The times when Kyon realizes something he couldn't even grasp lightly before is not only an powerful asset in the name of character development, but is also an great way to let readers evolve with the characters. The fact that the twists and turns become meaningful only later in the story is really awesome.
There are reasons I love this series, and this is one of them.