I'm American born and come from a very Polish family (can't you tell from my alias?). Both of my parents graduated from medical school in Poland. My father was born in Poland and graduated from the school at the top of his class and is now a very successful cardiologist here in the states. My mother is American born and decided to do the Polish med school bit after having a lot of trouble getting into school here in the states. She's currently a happy internal medicine doc who has a lot of autonomy and a lot of flexibility in her job. They have a lot of friends and acquaintances who have gone the PL med school route and have come out successful, but as previous posters have noted, it still comes with its risks.
Some foreign med school programs have the option to do your first two years abroad with the option to transfer over to a US medical school on the condition of good board scores, grades, etc. We have a close family friend who started out at an Italian Medical school and came out as an ophthalmologist from a US med school. The key point is that you HAVE to perform well and play your cards right. The competitive residencies are already too much so without the additional burden of having to prove yourself over a decision to go abroad. My dad highly recommended shooting for only staying abroad for 2 years since basic science is similar across all medical schools, but US medical schools drastically distance themselves from the rest of the pack due to their incredible education in the 3rd and 4th year rotational years.
I've had to start considering this route as my own applications are running a little slow. Who knows, perhaps with the way that the US dollar is going and the impending massive changes to the US health care system in the next couple years, it might be advantageous to have graduated from an EU medical school and then try to do a residency in the US. If I'm not mistaken this would afford the option to practice not only in the US but also in the EU. I think this depends on EU citizenship, however. I'm a dual citizen and have that option, i think...
Poland is really an awesome place. The people are great and their economy is really booming, and it's beautiful. The thing you have to consider is do you really REALLY want to go for it at a foreign med school. As was stated earlier, the DO option may be better in the long run b.c you stay in the states. I have heard a lot of negative feedback, intra-medical-professional, when talking about the DO option to other docs. DOs are just given the upturned nose by a lot of MDs, which sucks - most DOs eventually go to a MD program for the residency. Additionally, there ARE easier ways to get involved with health care ( Physician Assistant, Nursing, etc. --- see
http://forums.studentdoctor.net/showthread.php?t=482046 ).
Definitely get in touch with students already in those programs.
Best of luck with everything!