I am using umbraco 7.2 and created some mandatory member type. I used a macro to register member from client side. At this point validation is working for Name, Username, Password and Email but its not working on other member types I created. 

 @if (registerModel.MemberProperties != null) {

for (var i = 0; i < registerModel.MemberProperties.Count; i++) {

                       <tr>

                            <td width="120px">

                                @Html.LabelFor(m => registerModel.MemberProperties[i].Value, registerModel.MemberProperties[i].Name)

                            </td>

                            <td>

                                @Html.TextBoxFor(m => registerModel.MemberProperties[i].Value)

                                @Html.ValidationMessageFor(m => registerModel.MemberTypeAlias[i])

                                @*<span style="color:Red;">@Html.HiddenFor(m => registerModel.MemberProperties[i].Alias)</span>*@

                            </td>

                        </tr>

                    }

                }