1. As mentioned, there's no way to tell what this is or what it does. Very confusing.

2. Why should I register?

3. The login link doesn't work from the register page.

4. It let me register without providing a valid email address or either of the passwords. I registered with email address 'asdfasdf' and left the password blank. Interestingly, I was able to login using this :-)

5. There's no error messages on the registration form when the validation does work.

6. On the profile form, if I leave a required field blank and then submit the form, it erases any of the values I did provide.

Hard to provide more without knowing what you're going for...