The large wars of the 20th century were more bloody than anything in the Middle Ages but the constant daily violence of the Middle Ages was much worse. The Amsterdam homicide rates for example reached as high as 47 per 100,000 people in the mid 15th Century compared to 1,6 per 100,000 today.
So, comparable to many modern US cities? Or any Third World city? *shrug*
Then there was the continous low level warfare between feuding lords, cattle raids, etc. All in all you had a higher percentage chance of dying a violent death in the Middle Ages Europe than in the 20th Century Europe.
Probably not. 20th C. Europe was rather brutal.