Yes, I have. You are living in an Internet disinformation unreality - just like the nonsense the right wing craps out about how horrible and dangerous NY is. As empirical data, look up real estate prices and tourism to the three cities, and see how Warsaw compares. Remember, people in Europe can easily go to Paris or Warsaw; going to London is a bit harder.
And that is with massive disinformation campaigns against immmigrants and 'liberal' cities.
(No offense to Warsaw - maybe only NY and Tokyo measure up to London and Paris.)
Paris and London used to be great cities. Not anymore, they are just living off their formal glory.
It feels like your image of London/Paris is based of movies and tv shows.