Admittedly, the Call of Duty series has at least attempted to rectify many of its most frustrating implementations. Many might argue that the series has changed little from iteration to iteration, but cosmetic changes are often made in light of community feedback to help adjust the experience.
The engine might have remained untouched since Call of Duty 4, but many gameplay features have changed in light of a shaped and dedicated community of gamers.
Looking over each of the games raises some genuine frustrations, and it's certainly no wonder why the series is just as aggressively hated as it is passionately loved: certain design elements are quite bewildering, added in such a way as to unbalance the experience and give players/teams unfair advantages over the opponent.
In many cases these frustrations have been rectified, but some still remain in the latest iteration: Modern Warfare 3.
Let's take a look back at the most frustrating design elements in the Call of Duty series over the years, how these issues have hurt the experience, and if they've even been rectified.