As a person of polish descent, I was heartbroken to visit Warsaw and see beside ~90% of the most beautiful buildings a little plaque and statement basically reading "this is a reproduction, the original was bombed to hell in WWII and here is a picture of the ruins".
As a Pole raised in Warsaw I can give you a different perspective: it's actually surprising for children to see things which were not destroyed and are original.
I still remember my younger brother, as a 10-year old, visiting one of the French Loire castles and asking my parents: "so, all this was rebuilt after the war, right?".
I'd say it's already very impressive that they managed to reproduce how things looked.
Now, I've never been to Warsaw, but judging from other cities I've seen that have been destroyed in a similar way, many cities -- and especially city centers -- never even managed to evoke the original looks. From their modern day form, you can only guess how the city used to look like, given enough fantasy (if at all possible).
So while it is a huge tragedy, at least what you see are reproduction, not 50's/60's concrete blocks that were built out of necessity to supply somewhat affordable commercial and residental space.
