Of course, I think what makes Cassino stand out is the relatively very small area of combat that produced these numbers of casualties, in 4 short battles, compared to Stalingrad which was over a much wider area, and over 5 months of constant fighting. Also it was a very high amount relative to...
55000 Allied casualties, compared to around 20000 Germans, was a brutal battle. Bit of local interest as well, - From Wiki - The fighting was brutal and often hand to hand, but the determined defence held and the Royal Sussex battalion was beaten off, once again sustaining over 50 per cent...