The M in MTO is for Mediterranean, as in Mediterranean Sea, as in Straits of Gibraltar and the "soft underbelly of Europe." It had more strategic value to the UK/US than Russia. It also diverted German (and Italian of course) resources that could have been put to better use if they had a secure southern front.
This four-volume subseries begins with American troops, part of the Allied Expeditionary Force, wading through the surf on the beaches of Northwest Africa on 8 November 1942 and ends in the Italian Alps some 31 months later with the German surrender in May 1945. With supply lines always stretched to the breaking point, American and Allied soldiers faced a determined and resourceful enemy, harsh weather, inhospitable terrain, and indefinite goals in what many would later consider as little more than a sideshow to the "real" war in northern Europe.
http://www.history.army.mil/books/wwii/11-9/mto.htm "Nevertheless, as these volumes trace the slow but steady advance of the Allies from North Africa, through Sicily, and up the Italian boot, the role that these campaigns played in wearing down the Axis powers and contributing to the final victory becomes evident. The authors also devote considerable attention to the politico-military negotiations leading to the surrender of the Italian Army, where military men were required to double as diplomats."
http://en.wikipedia.org/wiki/Military_history_of_Gibraltar_during_World_War_II - see where this leads you.
Bottom line is it was deemed a necessary area of operations on many levels by military (and political) minds much more attuned to the situation of the day. They *had* reasons. Do your homework and see if you agree.
