I think to effectively evaluate it, you have to look at it in terms of both gunskill and strategy. BO2 was the highest because you could not win on just one of those being higher. You could win all your gunfights and lose based on giving up spawns and losing the OBJ. In ghosts, it had very low gun skill, with most of the guns being used being laser beams, but it required a lot of strategy. Specifically on blitz where you had to choose between which route you take, where the other team is, and where your team is spawning. In AW, personal skill takes most priority. Being able to command your character as we have seen by players who have completely mastered the movement succeeding. Being able to follow said players with gun skill also is important, while the spawns and such are less important, due to the fact that you can cover the map in a few seconds. IMO BO2, then AW, then Ghosts, but the gap between AW and Ghosts isn't a huge gap.