I would say that the lack of diacritical marks was an issue except it seems to do fine with some words. Take the first sentence: everything except the last two words has marks. 'Zaczac' even has two and it got it right. And translating 'No' as no is pretty strange, as is 'uczyli sie' as 'teach all of August'.
Or in other words the translation program sucks.
I did the test a while back, translating some random bits from newspapers. One can for the most part understand what is written, and easily improve it to standard English. The program seems to get worse for other languages. With Swedish, for example, one may as well not bother...
