hello,
i am using 2.3rc1 and i could see that most of the windows modules has some issues, particularly with IIS
If you think you have found a bug, please raise specific issues on the ansible issue tracker. https://github.com/ansible/ansible/issues
Please ensure you fill out all the information in the issue template, as this will help capture all necessary information for debugging problems.
Also you will need to create minimal playbooks to demonstrate the problem so that they can be reproduced by others.
For the IIS modules, make sure you have first used win_feature module to install IIS.
Hope this helps,
Jon