It honestly doesn't bother me. There's probably no one in the world who has a Shepard who looks and acts exactly like my Shepard, so having the default "female" Shepard on the cover would be just as far removed from what mine is.
It's of no concern to me. But, for the record, yes, I consider canon!Shepard to be a male Earthborn Sole Survivor Soldier who made mostly renegade decisions, which is apparently what the game thinks too, just as I consider canon!Warden to be of Male Human Noble origin. The fact that I never played the game as either of these doesn't diminish the experience for me.
It's of no concern to me. But, for the record, yes, I consider canon!Shepard to be a male Earthborn Sole Survivor Soldier who made mostly renegade decisions, which is apparently what the game thinks too, just as I consider canon!Warden to be of Male Human Noble origin. The fact that I never played the game as either of these doesn't diminish the experience for me.