Reviews on steam aren't pretty, probably the reason why its on sale in the first place. Wouldn't personally recommend this, but if you're the sort of person who enjoys these games it could be a decent deal.
Welcome to the new era of Call of Duty®.
Call of Duty®: Modern Warfare® II drops players into an unprecedented global conflict that features the return of the iconic Operators of Task Force 141. From small-scale, high-stakes infiltration tactical ops to highly classified missions, players will deploy alongside friends in a truly immersive experience.
Infinity Ward brings fans state-of-the-art gameplay, with all-new gun handling, advanced AI system, a new Gunsmith and a suite of other gameplay and graphical innovations that elevate the franchise to new heights.
Modern Warfare® II launches with a globe-trotting single-player campaign, immersive Multiplayer combat and a narrative-driven, co-op Special Ops experience.
You also get access to Call of Duty®: Warzone™ 2.0, the all-new Battle Royale experience.
Reviews don't matter for Call of Duty. It sells. Really well and people will buy the same game over and over every year. There's even another new one rumoured for this year that's an "extension" to this one.