First off, Joy Of Life is a novel. It has the pacing, characterization, and plotting of a novel. If you come in expecting the usual face-slapping webnovel trash, you'll be disappointed. No, lie down, grab a cup of tea, and properly savor this.
Characterization is where Joy of Life shines. The enemies feel like real people, with their own goals, values, and interests. Hell, some of 'em go on to become friends!
As for plotting and action, it's well done. Fight scenes feel tense, the protagonist gets his badass moments, and generally nothing feels too gunky and overdone.
If I have one complaint, it's that Joy of Life's protagonist--it's hard to pinpoint what he wants, really. Who is he? What are his goals? The emotional drive of the story, or at least the protagonist's contribution to it, can seem hollow sometimes.
In short, this story is a 5/5 by the standards of webnovels, but as a serious novel...it's good, but nowhere near great.