I am open to suggestions, so feel free to drop some based on my explanation above, like I said before, this is majorly for fun, the merit side of it is something I added as minority, to encourage users to join.
Somehow I think your idea can still be considered as something good to support other users' ratings, but I doubt its success rate. Although actually you have a number of rules and limitations, but I think your hand should be stronger than the hands of other users. I mean you are not a merit source and it will make it difficult for you to appreciate other users' posts because you only get 1 sMerit out of 2 merit you receive from other members.
Even if you rely on merit source to specifically review those users without sending a link to their post, then it will just waste a lot of time for them. I'm sure many of them won't bother to do it, but I actually support your idea. Just my two cents.