This sounds as though there is a specific article or chapter the question is referring to, so be sure to take that into account when considering my response.
Here are three possible criticisms by those in the West of Islam and its treatment of women:
1) In some Muslim countries, women are not allowed to vote or hold office, which means that they are largely unprotected legally and therefore subject to abuse and discrimination.
2) Some critics argue that the interpretation of Sharia law on female victims of sexual assault is particularly anti-woman. In some societies and regions, a woman who is raped can still be condemned if it is thought she did not fight back enough, as though she were somehow willing. In some cases these women have been sentenced to lashes, or even stoned to death.
3) Some have argued that the most restrictive Mulsim societies require women to wear the Burqa, completely covering them from head to toe, with only minimal sight allowed through holes in the fabric. While the Hejab, or head covering, is common in most Muslim countries, they argue that the Burqa is a means of repression of women.