TheTome56: I don't think any games should be refused from GoG personally. I think customers should decide what they want to buy and GoG should facilitate that.
PaterAlf: I don't think that would be a good idea. Just look at Steam, Desura or Itch.io where you have to wade through tons of shovelware, broken games or unfinished alpha/early access version just to find a decent game.
I don't always agree with GOG's decisions, but all in all I think it is a good idea to not allow every game here. We have some stinkers here as well, but the average quality is much higher than in most other digital stores.
To be fair, no one is calling for a Greenlight or Early Access system on GoG. Those systems are a complete mess due to Valve's negligence on moderating them and I personally wouldn't like to see some analogue of them here.
But I also think people overstate how difficult it is to find good games. There's more than enough information floating around that anyone can make an informed decision with a simple Google search. Bad games get forgotten, but good games make themselves known
Like the Macho Man Randy Savage once said "Unjustifiably in a situation I'd rather not be in, but the cream will rise to the top, OH YEAH!"