In most cases only to those who are married to Polish citizen ( or if they established long- term economical relationship with Poland, meaning owning a business not just working ) , multiculti children will never get unless they are children of at least one polish citizen . Unlike in Canada or USA ( the most multiculti states) .
I got no idea of US or Canada... yea a little about USA but in all the wrong ways by a friend who used to take prospective citizens with wacky plans from here :D ...
Anyways ... yes when they are married to Polish Citizen it is much faster. However on work and education they can get a PR, and later if they show proper reason for their stay in Poland, they can get a Citizenship. Although again, the 6 good friend (ex-foreigners and now Polish citizens) are all married to Polish, but even before that they had a possibility to gain citizenship and I think most of them already had a PR.
There is a length of time they need to stay ... and their conduct, capability, education, job ... it all matters. You cannot just discard it. Yes, businesses make it easier. But something making it easier doesn't mean that other things do not work at all.
Our immigration policy is not that stiff as you mentioned. Infact not many want to stay in Poland. I noticed that most just go towards UK, Germany or France ... etc (mostly to UK). Unfortunately for those countries, those who are usually not very capable in studies or clear of their goals go to those places.
Fortunately for Poland, or maybe atleast in my experience, I have found people will good education who would be capable back in their home country as well, prefer to stay in Poland and work their way for a living. Reason of choices range from interest in Polish landscape, a liking developed for the country, or relationships formed while their stay in here.
About fake stuff, I don't really mix with the unskilled labors found in shady alleys ... or discos with narcotics etc. I've been happily acquainted with people from reasonably good backgrounds ... coming from USA to Japan, from China to India, from South America to Canada ... etc ... Students mainly, business reasons, even activists.
The policy for immigration is infact not balanced. I always thought that with proper immigration policies, the high influx of those who have no intention really to stay in a country and contribute truly and effectively to its prosperity would not be able to make it. For this, the compulsory requirement of a certain amount of money in the bank (which seems to take all the focus) needs to be removed, and focus must be given to genuine students. For this, the agents from Poland and those countries must be discouraged, and students who apply themselves to Polish Universities must be given the priority and welcomed with open arms even. Plus, our Universities can benefit too by getting into affiliations and partnerships with more foreign universities for student exchange etc...
Positive immigration is a healthy thing.