Open ID Is A Nightmare 16 years ago
Forgetting ID/Password is not the only problem with OpenId. The real problem I see is that, you're not only authenticated with your H/Y/GMail user name, but that you have to be authenticated on their servers and open a valid session there without you being aware that it's not closed after you login to the target OpenId site. You still have that open session even if you log out of the target site (or a go-between like ClickPass).
For OpenID to work as designed, the user should not have multiple ones and always use the same one wherever an OpenID is requested.