Call of Duty 4 is the best in the series
Killzone 2 is a shoe in for better than Killzone
Resistance 2 is amazing, but I thought Fall of man was better. It had a better health system and you could carry all guns at once.
Madden 09 is the best Madden since probably 05
Halo 1 was the best
Gears 2 better than Gears 1