em10
My experience is very different from yours too. We had our house renovated six years ago, by a bloke who's parents are from Greece...all his team were from Eastern Europe, and I was actually shocked at how good they were.
I mean...they had a pride in their job that I've literally never seen before. One day they started sanding the dining room floor, and afterwards they stained it. They put another coat on the following day, and then on the third day, they stripped it all off and started again. The reason? They felt it hadn't been done well enough. Believe me, it looked perfect to my untrained eye.
We then had our place redecorated by the same firm, although now it was a different set of Polish lads working.
Once again, they did stuff over and above what you'd expect from builders. Eventually I asked about their ridiculous levels of attention to detail. I was told that it's just the way Polish people are.
I'm not saying that your experiences don't count - of course they do, it's just that there's more than one side to the story. I literally couldn't praise Eastern European workers high enough.
...but if you're going to buy them a few bottles of vodka to thank them for their hard work, don't give them to them until they've completely finished the job, otherwise be last couple of days will be very difficult for them.