This mangaka for some dumb reason made the plot where volleyball>other sports on terms of difficulty, and that is plainly stupid. Along with terrible characters, horrible art, makes me want to drop this asap.
On the technical side, this manga fails on teaching the volleyball's basics to people that don't know crap about it (I've played a lot, and probably do know a lot of it too...).

If you want some sports shounen, don't read this...it's horrible, with a terrible art and storytelling.