A like system would probably be okay, I don't see any major drawbacks, and maybe as a result of having a like button we will see less users giving merit because they agree with a post. Since, in my opinion a like system is completely different to the current merit system, which sometimes gets treated as the same by certain users.
What about "dislike"? I mean, if you want to have "like", why not to have dislike too, seeing so much bs being written all over the place. I know that de-meriting was proposed too, but that would probably be too drastic, but dislike would be nice addition, especially if post that gets enough dislikes get hidden, so something similar to reddit.
I feel like this would just create unnecessary feuds, which don't get me wrong we have already, but would be exaggerated with something as simple as a dislike button. Right now, to show that you disagree with something, you actually have to come up with a decent counter argument on why you disagree with them, a dislike button means it'll be abused to attack certain users. Of course, it doesn't really mean anything, but to the person posting it might. A like button, being only positive, and doesn't actually have any bearing on the post means its mostly for fluff, but doesn't really do any harm either way. 
