HeroQuest is basically a game of abstraction. Anything can be a skill, because the skills are abstract ideas, and you can contest in anything, because the contests are abstractions too. Is that a benefit, because you have infinite narrative possibilities, or is it a deficit, because the abstraction is too obvious? It almost certainly depends on the player, and it's probably the most contentious point of this game. (Personally, I like the system of HeroQuest the best when the abstraction becomes very specific, such as with the clever sorcery system in this edition, but otherwise the abstraction makes me feel disconnected from the game.)
Of course this particular book is HeroQuest: Glorantha and the background on Glorantha that opens this book is terrific; it reminds one of why Glorantha is such a great world for adventuring. The rest of the book is also relatively saturated in Glorantha, particularly in the cult section, and from time to time it rises up to greatness.
This edition also builds on HeroQuest 2, where Laws did some clever revamping of the system to support story beats, and that's one of my favorite parts of the game. Yeah, it's abstract too, but it does a good job of adapting something that you don't usually find in roleplaying games, and that can actually create better stories at the table.
Unfortunately, I find some of the rules description in this edition a bit muddy. Some of the mechanics are pretty outré for the industry, so if anything more work was needed to keep the rules really tight. Unfortunately, I feel like things swing in the other direction. This is frequently due to referencing important rules (such as augments and pass/fail) which haven't been explained previously, but there's also insufficient specificity at times (like in the character creation).
Overall, HeroQuest is an interesting game and an interesting companion for the very exotic and mythical world of Glorantha. I still prefer my RuneQuest, but HeroQuest is an interesting alternative if you can make the system work for your gaming style.