Au contraire, they’re some of the best textbooks I’ve had the fortune of reading! :-)
They make the student work (participate actively in your own education), which I’ve noticed that American textbooks (at least modern high school & college textbooks) seem loath to do. I don’t know why — you don’t develop what you don’t exercise!
If you open any soviet textbook you will see the following text on title page: (loosely translated) "Supplementary reading for students of xx specialties higher education" it can school level or college level. But in essence those books are an addition to the course which is mainly delivered by lectures. You can study by yourself but it will be hard and you will need extra material to replace lectures.
They make the student work (participate actively in your own education), which I’ve noticed that American textbooks (at least modern high school & college textbooks) seem loath to do. I don’t know why — you don’t develop what you don’t exercise!