The Pro version of Comment Rating allows voting by logged-in users only, fraud detection with user ID, IP,
Cookie or off entirely, styling with CSS, controling inserting rating images to Posts only, Pages only or both,
or on selected post IDs. etc. Comment Rating Pro.

Comment Rating also has a companion widget plugin Comment Rating Widget.
To sort comments by votes, hide poor comments entirely, or show images neatly, ask me to help.
Questions or Problems: Comment Rating Plugin FAQ. Feature requests: Comment Rating Todo List.