I voted for 2007
Super Mario Galaxy
Uncharted
CoD 4: Modern Warefare
Bioshock
Mass Effect
Halo 3
Portal
Team Fortress 2
Crysis
God of War II
S.T.A.L.K.E.R.
Assassin’s Creed
The Witcher
Crackdown
So many franchises either debuted or continued their respective franchises legacy that cannot be ignored. 1998 would be the second best year in gaming imo.