If I take a look at the Dutch boards, lots of s****y projects are posted there.
Shitty (it's okay to type that word here) projects are not against the rules.
I also see a lot of spam and discussions that, in my opinion, don't belong on Bitcointalk. Also I see a lot of bounty hunters over there, posting things you can't take serious.
I barely visit the Dutch board, but I assume you mean the Dutch bounty/altcoin boards, right? Those have heavy spam all over the forum, not just in Dutch.
Can we do something about this and introduce a Merit system for local boards only?
The Merit system works on all boards, what do you mean by introducing it for local boards?