It's nice; I was a little appalled when the MC killed Renxue, Donger, and everyone else since he had no reason to, but in hindsight, it's understandable and even a little admirable since he stood by his morals.
Typical low-quality trash novel; MC wouldn't even achieve Genin if he didn't have his system. Dog author relies on the system as a clutch to compensate for low-quality writing.