Too many recent games. I don't know if it was intentional, but there are some ancient games that were trully benchmarks for their decade.
If this was an overall list since gaming started, games like Sabre Wulf for ZX Spectrum, Sensible Soccer on Commodore and Super Mario Bros. on NES would definitely enter that list.
EDIT: Ok, games of the decade. Sorry.
I'm sad GTAIII made that list while Resident Evil 4 was left out.
OH well, IGN...