Honestly 2-2.5 stars... but I love Dover and feel guilty. The few designs in the book (I didn't count, but it's roughly 50) are labeled or it'd be quite difficult to identify some of them. The designs are very small (21x27 up to 100x50) and mostly have 3-4 colours. They might well be usable to teach a beginner cross stitch or filet, but they're just not very attractive.
In the Kindle version (the only version I checked), at least two of the chart titles are switched (Skunk and Weasel). Additionally, some of the pages seem to be cropped off.
If you have a burning desire for a chart for an Onager however, this could be your lucky day.