The WordPress Comment Rating Plugin v1.5.0 allows ratings on your comments. Click the Live Preview button and scroll down to the comments section to see it in action.
v1.5.0 (Jul. 21, 2015)
New: Allow direct access of generated HTML items so allow theme authors to place the rating anywhere in a custom comment callback function. See FAQ.
New: Compatibility with WordPress 4.3 (tested with Beta 3)