Among all the manga in this world, there are bound to be many that are mediocre. Thousands of manga, and so many of them stick to the common tropes and cookie cutter formulas, not bothering to be original or impressive, but many of which may be enjoyable to read in their own right.
Hanatsukihime is not one of those.
Hanatsukihime is, essentially, a fairy tale. I read it in one sitting, about an hour and a half. It hooked me from eh very beginning to the very end. While this is a shojou manga, as a guy, I still enjoyed it, and honestly, while it is a shojou manga all the way through, it is still going to be just as entertaining regardless of your gender. In fact, I'd even say it has fanservice that may appeal to the males (for example, I don't think Lys ever wears any clothing that covers the midriff at any point in the manga, unless you count the cloak she sometimes wears) while at the same time, being a shojou manga (I hear the girls love Siva, and I can sort of see why).
The artwork is what you would expect form a shojou manga. The style is exactly what you would usually see. I loved the art myself. Definitely good artwork, good enough that one could read it for the artwork itself... though there's a whole lot more to be had here.
The plot was mostly character-driven. Everything is about the characters, and that is a good thing. Don't expect political intrigue or a quest to gain power levels, you won't find that here. There isn't really a lot of tension or drama, however, the managaka creates characters that are easily likeable and who readers care about.
Like I said, it's basically a fairy tale. Do yourself a favor and read this manga. There's no one who I wouldn't recommend this to.