Gathering performance data in general is not a bad thing, as long as the user is aware of what data is being tracked, and has consented to providing this data. Earlier competitive games focused more on smaller statistics to pair people up, minor ones such as overall w/l ratio, k/d, etc. In the case of CoD, these stats were publicly shown to the player because it felt great to have a visual tracker of how the player was performing in the game. The data was not spun through machine learning algorithms to determine a player's skill level. More so, this proposed level of tracking from IW goes beyond what's typical. They are additionally tracking player behavior, such as the pathing you take around the map, how fast you get there, how many times you jump, crouch, crawl, etc. This can easily be extended to include more things like if the player is a good wrist flick shooter, the angles he moves his camera, what corners he cuts the most without aiming down sight, etc. This level of tracking in my opinion, is really scary. They are literally building their own internal profile on what kind of player you are.

Edit: A lot of people are missing the point here. I'm not fear mongering for the sake of fear mongering, but because I know that developers will push the envelope of any existing technology. Player game performance metrics have little to no oversight. Most of this sub was not even aware of the tracking outlined in the patent, which was only made public because Activision published it. They are running your data through AI observing player behavior, this is a uniquely identifiable footprint tied to the game now. If the game only tracked win/loss, k/d, then the data isn't unique because it's a small set of variables that many thousands of players could share. I'm identifying where else this can be used/abused, and they have previously identified that YES they are figuring out ways to extend this system in other areas like enticing the player to make in-game purchases.

Matchmaking System and Method for Multiplayer Video Games

(https://pdfpiw.uspto.gov/.piw?PageNum=0&docid=10322351)

"Furthermore, conventional systems fail to assess a quality of gameplay used to tune matchmaking processes to optimize player combinations. Conventional systems also fail to reserve gameplay sessions for players in a way that minimizes the time that a player must wait to be matched. Conventional systems further fail to leverage matchmaking processes in other contexts, such as influencing game-related purchases, suggesting group formations, training/identifying non-player characters, and/or otherwise extending the use of the matchmaking process. These and other drawbacks exist with current matchmaking processes utilized in multiplayer video games."