You really can't take the series too seriously when you go in reading.
However, the characters are awesome. You can get their basics as soon as they're introduced, but as you continue reading, more of their facets are revealed. Sure, they're not fully rounded, but they're also not completely 2d. It's a good balance for a manga artist's first.
I personally enjoy it, the manga is a good slice of life. You'll find yourself rooting for the characters, hoping they succeed. When they don't, you feel their defeat and tension. To me that's what marks a good story and makes me want to read more.
You can get a good laugh from the characters' expressions and dialogue. Their personalities mix well and the main character, Izumi Ichiduo, is simply fun. His personality is gripping, you're pulled in to his story before you know it. Takeuchi Hallow has done that with all his characters which is a feat. Some are flatter and less interesting than others, but I'm sure as we learn more we'll really see them shine.
Izumi Ichiduo is not perfect, often times he acts rude and full of himself. However, his attitude doesn't get to you like the protagonists in 'Innocent Bystander Stuck in a Mysterious World'. He still shows his passion, sincerity, kindness, and hard working attitude. Along with his frustrations over loosing, his rudeness, and his ego. Making him not a programed robot, [°=°] like many manga protagonists.
Takeuchi Hallow did a good job, and I admire his hard work.