On the subject of quality control in the Marketplace, there is a Wishlist topic for that:
I don’t know if Microsoft would ever change their minds about that sort of thing, but I’m just putting it out there.
As another solution, there is also a Wishlist topic for having average developer reviews in the Marketplace so that everyone will know whom to go with and whom to stay away from. Admittedly, sharing this topic is self-serving because I’m the topic author, but I would share it even if it weren’t my idea: