Would be disappointing even if it weren't Toriyama. The whole reason the plot happens is because the main character was chasing around animals to kill them with rocks. I'd rather see him get killed with a rock, but instead we skip past his entire redemption arc to see the tepid battles at the end.
The series starts very close to the ending, so don't expect any character development. You expect things to hit the ground running, yet the main character is exactly where a hero would be if the plot had just begun - no peers, no history, unescalated odds, talks to his mentor like he has no clue what to do. He's busy saving a lizard or something. Saving nine hundred bugs and lizards took him five years?
You're begging for the final fight to arrive and when it does the climax is perfunctory. Everything... just works out. The dragon doesn't do anything. The villain powers up and instead of scattering the weakest heroes he starts fighting off-screen with their second-strongest, with no consequences for either combatant, so the good guys can examine their resources and go through a whole pit stop, restoring their life and powering up. They don't even rush! They know they'll get as much time as they need.
Kajika's power to take evil out of people is ludicrous. If it's moral and just to change someone's personality like that, why do Kaya and Donko get to opt out?
The last page was a surprise. After not enjoying reading it, I suddenly wanted the series to continue. For the first time, I had no idea what was going to happen!
Kajika has a good heart, but it makes so many senseless pacing mistakes, I can't recommend it unless you're truly starved for shounen action.