It isn't how the merit system is supposed to be used. You're supposed to use it to reward a post you think is constructive, engaging, etc, but certainly not for rewarding someone for a task completed and not to replace the facebook like button. This is totally absurd and misusing the system
Your words seems to be true, it is not giving a merit, but actually rewarding a merit that makes a quality post. However i can also see some unnecessary replies and comments out of the topic that gained merit. That's why there are also complaining on how merit really goes.