Well, i never actually gave Teachers Pet a chance (unfortunately, maybe i should check it out sometime), so i cant comment on it.
But the other 4 shows definitely deserve their spots.
I haven't seen a lot of Phineas and Ferb, but from i have seen i think its a very clever show, some of the humor dint click with me, but i liked the character interactions, the mad scientist dude and the blue Platapus thing especially.
Not much i can say about Kim Possible other than it was amazing in everything it did, especially the characters, they were great. It dint really bother me that Kim was perfect, cause Ron was a good foil for it. Not sure i dig them getting together at the end though, but i guess its better than Kim ending up with that Josh Mankey guy from the beginning of the series (other than his cool hair there was nothing cool about him). My favorite character was Shego, she was so awesome.
I use to watch reruns of The Weekenders religiously when i first discovered it (which was at the same time i discovered Pepper Ann, which i also watched reruns of religiously). For a show where they just talked most of the time it held my interest surprisingly well, it was greatly written and really felt real. I can see it being #1.
Anyway, Fillmore! has got to be my favorite show on that list. First i have to disagree with what the blog said, initially i had no idea what this was supposed to be parodying and I still liked it. Yeah, i thought it took itself way to seriously, but that was the thing that was the most fun to watch. Perfect blend of action and comedy and drama too IMO, the plots were amazing, left me thinking for hours after many episodes. And of course, as always, i love the characters, most of the one shot villains were surprisingly well developed in those single episodes.