Heavy reliance on GDZ can lead to "mechanical" copying without understanding the grammar or vocabulary.

Some educators note that the materials can be difficult for "weaker" students to handle independently, often requiring significant teacher intervention or parental help.

The Kuzovlev textbook is a comprehensive but demanding tool. For parents and students, is an effective "safety net" to ensure assignments are completed correctly, but it should ideally be used for checking answers rather than just copying them to ensure real language progress.