Anyone can revert vandalism and bad-faith edits, but it takes a couple of clicks in the page history to get it done. Users with the "rollback" permission are able to undo bad edits with one click, by using the rollback link on diff pages, user contributions list, or the list of recent changes.
Rollbackers on Warner Bros. Entertainment Wiki are also able to perform a Recent changes patrol. This feature shows whether each edit has been checked to make sure it conforms to the policies of this wiki. It prevents a duplication of effort by clearly indicating which edits have and have not yet been checked by a member of the patrol (the members are all rollbackers, admins, and bureaucrats).
It is important to note that admins already have rollback rights by default. Users with rollback rights are just users who are not necessarily an admin.