CoD1 and UO were my first, didn't get CoD2 for some reason, got Big Red One and CoD3 on PS2. Then got CoD4, WaW, MW2, BO. Honestly how "old school" you are means nothing, apart from indicating you should be better, if you've been playing since CoD4 and still struggle to get a positive K/D then you're obviously just crap at the game. The series peaked with CoD4 however, which is why its kind of important to have played that because thats what everyone compares the newest release with. If for example you're arguing that BO is good on the basis of it being better than MW2 then you fail.