IIIIITHE1IIIII on 20 December 2012
Halo: Combat Evolved.
Greatest campaign and story development to date. All of them (except ODST, which is understandable since it was originally not gonna be a full price game) are above 9/10 though, and they all have their strong sides. I could make arguments supporting any of them being the greatest, really. They are all unique.
