(+) Good Characters. The characters make or break anime for me, and Night Wizard's cast was almost universally likeable. Hiiragi's determination, Elis's caring about her friends, Kureha, Akari, Anzelotte--there's nothing more subjective than if you like a given character or not (just ask a group who watched Sukuran who should end up with Harima and watch the brawl ensue) but for me the whole cast of Night Wizard was great, and impossible not to root for.
(+) Character Designs. The character designs were brilliant, hell, even the 'bad guys' were moe (Bell Zephyr in particular). Elis may even have the most moe character design I've seen all season, proving once again the Shirakawa Kotori White Beret Rule: namely, that white berets double the moe factor of whoever is wearing them (although Kotori is uber-moe regardless). Maybe it's a holdover from watching Manabi Straight and Potemayo, but I loved the gradient hair too.
(+) Plot Twist. The plot is where Night Wizard really surprised me, with the plot twist after all the gems are collected taking something that looked generic and making it much more interesting. The first episodes, the ice skating one in particular, were good in their own right, but once all the gems are collected is when the shit hits the fan and things get really interesting. It reminded me of Cardcaptor Sakura in a way, how at first you think the plot's as simple as it can get, since all she has to do is collect all the Clow Cards and the story will be over...but it's not that easy...
(+) OP and ED songs. Both pretty addictive, the OP up-tempo, the ED more ballad-like. Even a real anime blogger singled out the ED as good.
(-) No Kiss at the End? I'm with Hinano on this, maybe it would have been corny if Hiiragi kissed Elis after he is reunited with her in the last episode, but so what? They were probably just too afraid to piss off the Akari or Kureha factions, but come on, I want Hiiragi x Elis damn it.
(-) Monster Designs. Night Wizard's skeleton-like things are better than what we got in Venus Versus Virus, although I realize that's like saying something's warmer than absolute zero.
You could argue I'm easily entertained since I survived re-watching Yoakena, but I can say I looked forward to watching Night Wizard every week, and when I sat down with a choice between a couple different series' new episodes to watch, Night Wizard generally won. Having said that, this is not the kind of series you want to watch with someone who thinks anime should be profound, or wears all black all the time and thinks if half the cast isn't dead or dying by the last episode then it's not worth a damn. It's basically a feel-good, everything-ends-well anime series, with some action, drama, and plot twists thrown in to make it interesting. In movie terms, it'd something like "National Treasure"--better not analyzed too closely but still fun to watch if you accept it for what it is. In the end, while I can't say it's the best anime of the season or anything, it still passes my "DVD test" and makes me glad I'm an anime fan--if this makes it to region 1, I'll add it to my collection in a heartbeat.