Man, I tell you a secret: You can enjoy the forum without getting merits.
If you had a pretty active week and you got only 2 merit AND you complain, you have to blame yourself, not the merit system.
Otherwise, you should put more effort in what and how you write it, before calling the system vague.
Allow me a little bit of self promotion,
that is my story, but actually it's full of other people out there with similar ones.
Don't take me wrong, I don't want to post in the forums
BECAUSE I want to get merits or
BECAUSE I want to get paid signature posts.
I want get paid for signatures
BECAUSE I would be posting either way and I like being merited
BECAUSE people like my posts... it's a matter of feeling the achievement!
By the way (a bit offtopic), it was like 2 weeks ago when I missed a weekly signature payment (worth about 40$ after the price hike) for just 1 less post!!! My point is, I'm involved in the forums without counting my postcount or even my merits. So your "secret" is something I already know!

~
Same feels, I always missed a weekly signature payment because of my insufficient posts but still don't bother if I will get the payment.
I don't think that's the point here but it's true that you can enjoy the forum without merits. If you want to have a good reputation for discussing something, then merit is a valuable thing here. Merit simply means you have the quality, the information, and have sense. So if you have one, then you're doing good at a discussion and conversation but it's not mandatory for everyone to get it especially when you're just a normal one.