If this is the first time you're going to watch Munto, I'd suggest to skip the Ovas and come directly to the anime, because the first episodes are practicaly the same as the ovas. Story: At first the story seems to fall in many cliches, yet, it's a rather original and enjoyable chosen-one story. I'd say it's a bit slicy-of-life convined with a bit of fantasy and a growing themed-anime, with a lot of tenderness and loyalty involved. Art: The art is quite enjoyable, the characters are very cartoony, but fit with the fantasy story very well. The only thing is..., well, the art by itself seemsto change through the anime, not sure if I missed the explanation, but Munto seems to change constantly =P
Sound: Most of the music was too pop for me, but I must say I'll give it a 10 just for this sole song: Hikari to Yami to Toki no Hate, that has this fantasy/medieval feeling and has great lyrics that cover perfectly the feelings of this anime.
Enjoyment: As it is a very short anime is hard to get bored, although it might be a bit slow for action lovers, fights are not the main focus here.
Overal: If you enjoy stories that leave you with a bittersweet after taste and are willing to deal with the fact that the plot will develop quite fast without much explanation as long animes, I think you'll enjoy it.