They're coming slow because we have only 3-4 active level designers, so things take time when everyone has real-life too. We are also going to have few more new maps soon-ish. That way we can test the build on you guys and get your input and feedback, not just from our internal test-team. There also lots of gameplay related things to adjust and polish to make things more interesting, it's one of the reasons we're in Beta.
I admit we have many issues in the mod (quite many have been fixed as latest version at the moment is 1.04, which was released week ago) and we are working on the project very actively to fix stuff the best we can.
I personally liked this review, because it was honestly written. Thanks for the review, even it wasn't praising our work and telling how everything is awesome. Also, I'm the Lead Level Designer of NMRiH.
Late post, but thought still throwing few words here.