I was replaying through the COD4 campaign when I realised that I actually enjoyed it. The timed missions were tense and, in the parts that I couldn't remember from last time, I found myself surprised about the plot twists. The game has dedicated servers full of fun mods (PC only); cheats unlocked by gathering intel and a bonus mission at the end which can only be described as awesome. Why is this game so much better than MW2? The budget for the sequel was huge and it was made by the same people (everybody started leaving IW after MW2).