5) Call of Duty: Modern Warfare 2 (2009)
Truth be told, Modern Warfare 2 might not have had a real chance of surpassing the now-iconic original – but it went hard trying to do so, and turned out some of the top campaign moments of the entire series. Remember the "No Russian" mission? Gripping, electrifying stuff.
The rest of the campaign was a bit up and down, but it was still a blast to play through, and the multiplayer component built upon its predecessor, adding further depth and some of the series' best maps to date.