How anti-intellectual, sad and absurd.
This is probably how book reviews read in Idiocracy.
The writer knows their audience very well. People who want to learn topology. The kinds of people who have learned that you don't make a decision on a book based on colorful it is. Otherwise you will read a lot of trash.
In general. You can't be an expert in a field by choosing what you read based on how pretty it is. "Oh sorry, we didn't read the reference handbook for the plane we're flying because the fonts they used in the 70s were too ugly", "Yeah, I'm a heart surgeon but I only read papers in Times New Roman with at a minimum 4 colors".
This is pretty much the dumbest shallowest comment on a technical book I can possibly imagine. "The words are hard to evaluate. The fonts aren't great and but it's just about colorful enough. 5/10"