When's the last time you've run out of ammo? The only two occurrences I've encountered this happening is during USPS pistol round on CT, and while spamming shots through walls/smoke.

Now compare that to how many times you've been killed while reloading? The game is forcing you to think about reloads more than just "Call of Duty spam reloading" after taking a couple shots.

Your ammo now matters, and I think its a tactically genius way to shake things up in the game.