It would be nice if we could 'like' the comments (just like in facebook) of other reviewers. It's a quick way to show that you agree with the comment.
Why not up/down votes?
I belive that a down vote is not very usefull since you have to explain what exactly you don't agree in the comment. But If you don't like the 'like' word because is too 'facebook' , It could be any other word like 'agree', or even a icon.
While I understand the scenario, I don't think we'll be able to get to doing this within a reasonable amount of time and I'm going to close it for now.