I like to think my books are good. One has over 900 reviews with an average of 4.8 stars. Two others have over 100 reviews with about a 4.6. The 4th one has about 20 reviews with 4.4 stars-ish (I didn't follow the formula on this one, my own fault).

I'm not the only one doing this, of course. Most of the books I see my competitors make are of lower quality, but they probably paid a lot less for them. In general, books made by people like me read like really long blog posts - because that's where most of the information comes from.