The effect is - in general kids from well-off families do better at school and don't have to work when they are 18 - so they study for free and get a degree that's worth more in labour market.
Others pay for studies and often have to work during the day, and study at evenings/weekends, and in the end they get a degree that's "second class".
IMHO it's still a better system than USA (I'm not familiar with UK system so can't compare), because the competition for students means that universities can't charge outrageous prices like in USA. Almost everybody can afford university in Poland. But it's not the ideal system some people think it is.
Also the primary and middle school is important. In Poland the default for every kid is to go to university, and teachers teach basing on that assumption.
High graduation rate, but _horrible_ education quality exactly because of these factors. Judging by my personal experience, a CS graduate from any not first-rate (and there's about 5 of truly first-rate places left) Russian uni/college is, on average, significantly worse than a self-taught programmer.
Also, incredibly high corruption: professors extorting bribes at exams (not just accepting bribes from low-perfoming students, but actually extorting bribes from students who would able pass tests otherwise) isn't something far out of the ordinary.
Tuition is actually not homogene, some german lands have it some not. But in the last years, they have been gradually reduced or removed ( in Bavaria for example).
> You have to take the decision if you want to go to university at the age of 10.
While I'm not a fan of Germany's tracking system, this really isn't true anymore. Leaving aside the fact that at least one state (Schleswig-Holstein) has pretty much killed tracking, your choice after fourth grade no longer locks you into one track. It's still pretty wasteful, but there's a lot of flexibility now (example: my niece is about to do her abitur after having already done an apprenticeship, and this was fully financed by the German government).
Regarding tuition, i've seen the tracking system more restrictive than having a tuition. You can always borrow money to pay a tuition, but if you choose wrongly ( or have really low scholar performance in the first 4 years of school), it is(was) pretty hard to access to the university.