Bootstrap/bind click event over ngClick
I think you did the right thing, if you used ngClick you would loose tooling: syntax highlighting, debugging, linting.

Other than that your code looks good, some minor nitpickings:


a single comma separate var statement is considered better:

var lbutton = element.find("span[class='lb-lk-comm']"),
    dlbutton = element.find("span[class='lb-dlk-comm']");

You keep repeating "lb-voted-comm", you should use a constant for it.
I only understood after reading likeACtion/dislikeAction that lbutton/dbutton stand for likeButton, dislikeButton ( I thought it was left button, double click button or something ), you should spell out those variables names.