User blog comment:Damac1214/Call of Duty 4: Modern Warfare named 2nd best FPS of all time by Gametrailers/@comment-1263839-20121205180537/@comment-1055346-20121205235448

I agree and disagree anon. Take a look at almost every single FPS game released recently. Perks, Create-A-Class type systems, Level Progression with unlocks. All were made popular with Cod 4