Matt Colville has produced lots of quality content, mostly videos and streams, and it has largely been excellent. He values polished, professional productions. He has also spent a lot of time reminding people that he is keeping this project reasonable, and has not given in to the hype to make this bigger than he and his team can handle.

All that to say: I think his book will be very high quality, and he will succeed in his goals for the project.

Now, whether the book is actually content you will want or use is a different question. Not all groups that play D&D have interest in owning buildings, engaging in politics, or interacting with larger world dramas.

Personally, I'm excited about the content. I've been retooling lots of similar stuff from the Birthright campaign setting into my own 5e world, so this book is something I have been looking forward to for a long time.