7. Call Of Duty 4: Modern Warfare 2
You must experience: The big emotional moments from the campaign, and the most famous multiplayer in the world. Everyone's heard of Call of Duty these days, but precisely because of that its developed into one of those franchises whose reputation precedes it - meaning many up n' coming gamers merely sit out the yearly instalments like they would any given year's sports titles. All that said though, the mainstream gaming scene-slaying behemoth COD has morphed into all had to come from somewhere, and although the original Modern Warfare make some gigantic waves, it was MW2 that saw developers Infinity Ward perfect both the story-side of things and the online multiplayer too. From the plethora of perks you can unlock alongside weapons you'll pour XP into - essentially creating a playstyle all your own - to the general feel of movement in everything from how fast the sights pop up to how far you'll slide after a sprint... it's this quintessential 'feel' of COD that's not gone anywhere in the last six years, cementing one of the pillars of online gaming in the process.