Documentation: install and update the extension
Documentation: create rating group and manage rating items
Documentation: set permission to vote on frontend
Documentation: vote report and its filter
Documentation: K2, Ads manager, JomSocial, Hikashop, Zoo, Moset Tree...
The total score is the result of all the criteria note, minimum is 0 and maximum is 100.
To stop user to cheat with vote we use IP address.
Yes you can, in different ways.
You can disallow votes on frontend or to a specific Joomla user group. To disallow frontend voting, set frontend voting to Off in the criteria. To limit voting on particular user group, use the general options.