It's a pretty abysmal and shoddy sight for the supposed 'City of Love'. In combination with the recent non-stop terrorist attacks and rioting, it's not hard to see why Paris' tourism has taken a nose-dive.
I can't speak for the rest of the world, but London's underground is spotless and I can't recall seeing any limbless, homeless Syrians during my last few visits. London itself is far from perfect, but at least its basic infrastructure isn't grossly neglected.