Yes, a cursory glance at written Polish should be enough for anyone to understand why Latin alphabet is a poor match for Slavic languages.

Oh yes, Polish, the difficulty is shown in this 1:19 slice from a movie: "Grzegorz Brzęczyszczykiewicz " -- https://youtu.be/AfKZclMWS1U

Your are getting downvoted, but polish writing system really is not great. There are both non-english characters (ą, ę, ś, ć, ź, ż) and digraphs (rz, sz, cz, dz, dż, dź, ch). Also there is done overlap here and some sounds can be written in more than one way (h ~= ch, ż ~= rz, ć == ci, ś == si, etc).

At least you can pretty much always tell how to read a word looking only at its spelling.