from my experience (we only flew LOT once in business), they are horrible. Absolutely awful.
Not only their service on board is horrendous, but we also did complain and requested a refund -
there was no lounge at Newark, food was cold and horrible etc, etc - they denied even though
it was a human responding - in a typical awful Polish way - not a robo-email.
We will never ever touch this garbage airline again.