The traditional time signature is 3/4. The following version is slow and rocking, which I was told by recent immigrants is how it's traditionally sung, and this definitely has good Polish pronunciation:
http://www.youtube.com/watch?v=sQsSVrtLR3M

A major reason for a vast difference between spelling and pronunciation: use of an English keyboard to write the Polish language. The English letters a, c, e, l, n, o, s, and z do occur in the Polish alphabet, with their specific sounds, plus the same characters also (when using an English keyboard) serve as stand-ins for characters that are uniquely Polish and have separate sounds. As with English and some other languages, certain sounds change according to where the letter occurs in a word, which I noticed most prominently with W (sounds V or F, depending). Best English parallel would be S which can sound S or Z, depending. (view the Polish alphabet here)