Sure as hell it's a very popular show (we're getting steady 100k+ downloads every ep), but I don't think it's all that exceptional.
It's a shonen show full of action. The art is ages better in the anime than the manga, which is a relief (I hated the manga's art). As for the writing, the plot seems to be quite cliched with all the dark and gloomy conspiracies in the background, and the drama is the standard you can expect from a well-selling shonen (the likes of Naruto).
The dialog's quite simple, but I don't mind that. Current goal: translating an episode in 90 min. (I think I couldn't manage it under 2 hours so far.)