First, writing quality. Its not good. Its readable, but as everything in this book it degrades as the book goes on. The grammar is all over the place.
Cant really say much about updates, since I just binged 260 chaps. But doesnt look too bad.
(this part may contain some spoiler, but I dont name anything specific.)
Story... horrible. The first part is very nice, a lot of world building and focus on magic, somtimes some romantic scenes with his wife, and at some point he gets a second girl. So yeah, its ******** harem. But later on it just turns into badly written sex every single chapter and at some points the story just straight up repeats itself. Just SAY that his "essence" can heal everything magic related. It starts as a nice magic novel with some sex and romance every now and then and after 250 chaps its a badly written ero novel that sometimes justifies why he gets a new woman. Author if you read this, a harem with more than like 5 people just loses any sort of romance and is a plain ****feast. Which is fine, but then make it sound like its a ero novel and not a fantasy one.
Character are the same as story, they are pretty nice in the beginning and get shallow in the end, World background as well, but it got built pretty nicely in the beginning.
All in all, badly written, story degrades, has some inconsistencies every now and then, but the story itself had potential. It was nice until the like 3rd wife came.