Also what would you think would be a better look for it?
For me I don't like it. It's mainly due to the fact that it's nothing original. I just keep thinking of the thumbs up form facebook. To me doing arrows would look better and different than the thumbs up thing. Though I'm sure there are other websites that do that too.
I'm not 100% sure of the meaning of this question, but I think they should keep, the like button, but also add a dislike button, because that way I can dislike offensive posts, or questions, if they don't fully fit the blocking criteria