You have two points in your OP. One, that you have heard on the street that it’s easier for American guys to pick up Eastern European women. Yes and no. When I lived in Russia, I occasionally met some guys who were there for the mail order bride thing. While I am certainly not a prize catch, some of these clowns were absolutely lower on the food chain than I am. And they were finding some success because there is a segment of women who realize that Russian men have set the bar pretty low. After 10 years of marriage, Mrs Slug has gained a whole new appreciation for me after hearing the horror stories back home. Although, whether or not she realized that when we got married, I cannot say.
As to whether Eastern European women tend to think that women you might think are gorgeous are ordinary, I think there is a little of that. Eastern Europe is a pretty big place to generalize though. And since Hungarians aren’t Slavs, I’ll leave them out of the discussion, even though I find Hungarian women to be beautiful.
My wife does indeed tend to think that some really nice looking Russian women are nothing special. I think part of it is because there is a “Slavic face”. Hard to describe but there are just certain faces that are very Russian. At one of the malls here, there tend to be a lot of Russians. Every now and then, we try “Red-spotting” to try and pick the Russians out of the crowd. We’ve become quite adept at it. Russian saleswomen pick my wife out in the store and approach her on a regular enough basis that I can rule out pure chance.
So I said all that to say this. I think that there is a certain level of familiarity to seeing “that” face. And whether the woman is nice looking or not, it just comes across as being rather ordinary.