+++point out any grammatical mistakes you've found.it's logicaly,coherently and well-written.
Okay.
+++There's just one problem with the majority of Poles.Please,don't feel insluted,though it can pull you apart.
What can pull you apart?
+++That is about a desperate,even burning need to prove their superiority to others when it comes to some linguistic matters.
What is about a burning need to prove superiority? 'certain' would be a better word choice than 'some'.
+++I myself cannot take it in(i'm a Pole too).
Take what in?
+++It's obvious that you guys are quite skilled at the grammar and all that jazz
Which grammar? You've used the definite article incorrectly here as you are referring to nothing specific. You are talking about grammar in general, not specifically. If you'd said the grammar of the English language, that would have been correct.
+++ but the way you communicate orally is just...well...to put it mildly...the way the Poles pronounce and talk is recognizable.
Ellipses are used to indicate omitted or suppressed words, not to indicate pause. I believe commas is what you were after.
+++There's no fluency in it but it's splendid that your speech in most cases is coherent.
You need a comma after 'but', otherwise it means 'except for'. You need commas before and after 'in most cases'. A lot of Polish people I know consistently make mistakes, but they are fluent. In fact, a few of them can't shut up once they get going.
As an aside, your assumptions are pretty baseless. The amount of Poles I have met that have flawless English is pretty small, though it's only become a popular language (as far as I have been led to believe) after the fall of communism. That said, some of the teenagers I teach have better grammar than some of my English-speaking friends.
And for the record, in 28 years of speaking English, watching English films and television, having lived in Canada, having been to America and Ireland, and having friends from most countries which have English as a first language, not once have I heard 'let it will be'. Though, I suppose it's possible some people say it. just not very likely, in my opinion.
Cheers