Question about Chaos Seeds The Land

With as little spoilers as possible I have a few questions if someone would be kind enough to answer. I just finished book 3 and I’m still interested in continuing so far. I do wish the books were a little longer. Here are my questions:

1. will there be way more world building in the later books?

2. does the power scaling eventually have no more insta kill attacks like other litrpgs?

3. my biggest question what the hell happen to book 8 for such bad ratings? Seems crazy that the first 7 are highly rated then the huge drop. Did the author mess something up or ruin something? As little spoilers as you can please.