Personally, I find most Slice of life ऐनीमे in general to be boring, simply because there's usually no actual plot that builds up, no sudden twists that catch आप off guard, just these lazy comedic episodes with little to no correlation to the one before या after whatsoever. I get that it isn't the purpose of the genre to be all serious like that, hence why I prefer Shounen and action ऐनीमे in general. But I was just tossing my opinion out there, is all.
Now at first I really liked it, the character chemistry was great. Then later on it just... लॉस्ट its spark? I don't know, I just got bored of it somehow, and that generally doesn't happen या I would still continue to finish the series, but not in this case :|
Okay, this one's kind of a strange answer considering I watched this for a season and a half (and enjoyed), but I'm gonna have to go with The Third: The Girl with the Blue Eye. I don't honestly know why I kept watching this for so long, because looking back, it really was a generic कल्पना with characters we've seen before and a plot line that... um... what was the plot again? I've actually recommended this to people, and while it isn't the worst ऐनीमे out there, it really does get old after a while.