It's difficult to argue about the merit of subjective experiences, but I think that two things are worth emphasizing.
First of all, my experiences are colored by growing up in relative poverty in the 80s and 90s; I explicitly acknowledge that the Poland I left behind many years ago is not the Poland of today. I think that you are painting a rather rosy picture by implying purchasing power parity between Poland and the US - but I don't think I would be unhappy still living there.
Secondly, the appeal to some sort of a patriotic duty to stay in your country of birth is an interesting conversation that I had with several folks before. In essence, my take on this is that the allegiance you have to your children is much stronger than that to your ancestors and the historical circumstances of the place where you were born. It's a complex topic, but I think there are many equally defensible views.
Finally, as for your comment about "not considering criticism" - I think you may be reading too much into this sentence; some of the social critiques of the US that are prevalent in Europe are quite valid; many others are based on smug oversimplifications. The only thing I'm saying in the quoted sentence is that I wanted to find out for myself =)
Anyway, we won't have a very meaningful discussion on HN, but if you'd like to chat, please do drop me a mail :-) I think our views are probably more aligned than it may seem.