remuŝ:This page will help you understand some of the criticisms made against Esperanto. For the moment, it contains only a subset of those I have heard. I must acknowledge that the criticisms I had against the language vanished when I had a better knowledge of the language and the Eo culture.
Many new comers in the Esperanto movement are overenthusiastic; others are critical about some features of the language, and they attempt to "improve" it. To understand which attempts are bound to fail, and which might succeed requires a very good knowledge of Esperanto and of the evolution of languages. This is not something you acquire after reading the grammar and learning a thousand words.