Be sure to note the number: this is a deal for Modern Warfare 2, not its recent sequel. If you're new to the franchise, I'd highly suggest picking it up - the campaign is excellent, Spec Ops is brutal and there are still plenty of players around on Xbox Live. Zavvi will save you about £3, and more critically, weigh in under the crucial £10 mark.
Infinity Ward really delivered an outstanding shooter with MW2. Though the storyline gets a little silly for my tastes (sorry, but just fighting a straightforward war would have been enough context for the action in my opinion), the shooting is mechanically perfect, visually attractive and incredibly visceral. Not to mention that the multiplayer improved on the formula yet further, practically defining the online experience for many players.
Impulse Driven are willing to part with a download for £9.23, which we reckon is a fairly major saving.