Madoka Magica is a darker magical girl series in the same vein as older shows like Uta Kata and Princess Tutu. It's not as original and life-changing as its most ardent fans might say, but it's exceptionally well produced and if you're going to watch any magical girl show, it's probably one of the best to dip into. I'll also note that this especially applies if you're male because this is very much aimed at that demographic - I don't mean it's full of lecherous pandering or anything so crass, but the fluffy, idealised depiction of the sweet female characters definitely appeals to male otaku in particular.
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