I guess, to your original point, that ANY game can be competitive, but some games require more skill than others to excel, but in the end good players will always come out on top. However, the skill gap is much larger in Halo (mostly 1-3) than it is in Destiny just for the facts that I listed above. I don't really rank CoD as the most competitive game either because of the extremely fast TTK, which then becomes a game more about positioning than actual gun skill.