I'm not sure it is worse. Only Belgium is reporting on all deaths (up to 3 days in areas). Spain and France now include care homes (but not as far as I can see, other deaths in the community).
I think the main reason for the high death rate is population density. Where are the deaths highest in Europe? Where the population density is the highest in Europe?.
Madrid, Barcelona, Northern Italy, Paris, Belgium, The Netherlands and the UK. Moscow cases are now starting to increase.
The only densly populated area in Europe that has escaped the virus is Athens and that's because they locked down early.