Its more a problem when it doesn't feel earned, like when a character solves a conflict simply without any challenge or need for thought. People claim a character is Mary Sue-ish when they manifest a power or ability out of nowhere, or always win creating no suspense for loss.
You mean cheating. A Mary sue by definition wouldn't need to cheat. Fascinating really. Becareful you are about to make a circular argument. Don't do it lol. Come back.
