If you ask me to show you a series that has been completely underestimated, I will show you Noien. It's an absolutely wonderfull series and I am surprised it lacks fans. The animation is outstanding and the dub is great. It's almost everything you could ask for in a series, but it has been almost completely ignored by anime fans (I guess that could be a good and bad thing). (Story) It get's a little confusing in a few episodes, but there is very little filler and it stays on track. (Art) It depends on what you like. For me I thought the animation and action scenes wereamazing.

(Sound)
The soundtrack is good and very fitting (mood-wise). I like vocals in a soundtrack and it gave the series a good contrast in attitude.