A lot of people love this anime. I watched it and was fairly disappointed.
First few episodes were great and they were funny. But even back then, there were problems:
-random references that you had to be a master of Japan to get
-boring stories in each episode
But at least the characters were interesting. But as the series progressed, I came across SAD stuff, not funny stuff (especially Mesosa the rabbit). Sometimes it wasn't even attempting comedy, and was just being slice of life (though much more crazy). Great music though and Rebecca was cute if you are into that kind of thing.
But, in the end, it was overall not funny, boring, and even the characters started to develop annoying personalities (Especially the class rep).
And I noticed something: Negima?! is basically PPD Season 2.
Same art style, Paru and Rei look too much alike (especially hair. Paru also seems to have an ahoge), common monster (green toad thing), similar display of emotion, cartoon on a stick animation, same archeologist outfits, and a rosy blond. Also Baka Rangers from Negima have the same outfit from PPD episode 23 (despite the manga not showing them having any sort of outfit). Also, similar antics in both.