You don't think deaths per million population provides a good comparative metric?
No, because there are other factors to how deadly a virus is than simple deaths per million.
If you take Sweden/Norway and Finland together you have about 20 million people among which the virus can spread. These countries are not gigantically popular as holiday destinations (for ski holidays) or huge business/political centers. Add to that the huge size of these countries and low population density and you have a good situation for a virus not to spread if you lock down properly.
Now look at Belgium for example, the deadliest so to speak. It has about 11.5 million, add to that it's neighbors the Netherlands, France, Germany and Luxembourg and you add another almost 170 million to the 11.5 million Belgians through which the virus can spread. Which is a lot more than 20 and a bit million like Sweden/Norway/Finland have. Now I know Denmark is linked by a bridge but if you close down that option you have a good chance to keep others out besides those in your region.
Now you have Italy and Austria as popular vacation destinations for Germans/Dutch and Belgians and during the ski vacation period the virus starts spreading in Austria and especially Italy. Even schools go skiing in Italy from Belgium/Netherlands and they bring the virus back to Belgium/Netherlands/Germany. Then comes carnaval. A 6 day period of partying, drinking, drinking, fornicating, kissing, getting way too close to one another and you have the perfect storm for spreading Covid.
Now the disease is spreading through Germany/Belgium/Netherlands/France. All are more or less very densely populated countries. Especially Belgium and the Netherlands. Hospitals are struggling to keep up with the virus load and the chances of virus tracking and tracing goes out the window because it just spreads too fast.
Now with Belgium especially you have to add: being a big transport link for goods from the Antwerp harbor and the Liege airport (local hub for DHL and others). Then you add it being the political center of Europe, so loads of politicians coming and going (as well as civil servants, and you have more problems.
Last but not least in theory Belgium is a federation. It has to deal with the federal government, the Flemish government, the Wallonia government and the EU government all at once. It is a political nightmare.
So those are some of the reasons why looking at simple statistics for fatality is not enough, because it ignores:
- how populated a region is
- how densely populated it is
- local traditions and reasons of extra spreading
- easy cross border infecting
- and other less quantifiable problems
Just looking at the deaths is just not a true reflection of how good or bad a country did.