Force strong password meter

I don’t have any thoughts on other plugins, but I do have an extension available to premium support subscribers that includes a strong password meter (and requirement, as well requiring the user to change their password every x period of time).

http://rocketgeek.com/plugins/wp-members/extensions/downloads/

There isn’t specific documentation on the new extension as of yet, but it’s basically an expanded version of the plugin’s Registration Blacklist extension (http://rocketgeek.com/plugins/wp-members/extensions/registration-blacklist-extension/) with a number of additional features. The additional features are the password elements I mentioned above, a honey pot for the registration form (to prevent spam registration), and requiring users to change a randomly generated password.