  The melting condition for two-dimensional Wigner solid ( P.M. Platzman,
H.Fukuyama, 1974) is shown to contain an error of a factor of $\pi$. The
analysis of experimental data for apparent 2D metal-to-insulator transition
shows that the Wigner solidification (B.Tanatar, D.M.Ceperley, 1989) has been
never achieved. Within routine Fermi gas model both the metallic and insulating
behavior of different 2D system for actual range of carrier densities and
temperatures is explained.
