"So I think that Universities in Poland are much more careful about actually letting people graduate, while in UK pretty much anyone can graduate,but poor grades make their education worthless."
It's about the philosophy behind it. In Poland (and Romania too, BTW), an institution defends its reputation first and foremost. Somewhere else, it's more business-oriented and the reputation is kept more by marketing than by other means. That is also how "top universities" classification is made - by counting only the highest results, not all of it. It's a nice hack on human mind, as both the students' and the average employers' bells ring when they think of those "top" universities, abstracting away a lot of "uninteresting" information.
It's about the philosophy behind it. In Poland (and Romania too, BTW), an institution defends its reputation first and foremost. Somewhere else, it's more business-oriented and the reputation is kept more by marketing than by other means. That is also how "top universities" classification is made - by counting only the highest results, not all of it. It's a nice hack on human mind, as both the students' and the average employers' bells ring when they think of those "top" universities, abstracting away a lot of "uninteresting" information.