Okay to set the bar straight on my opinions and such, here are my favorite and least favorite games.

FAVORITE
Echochrome (5 out of 5)
LittleBigPlanet (5 out of 5)
Metal Gear Solid 4: Guns Of The Patriots (5 out of 5)
Metal Gear Solid 3: Snake Eater (5 out of 5)
Metal Gear Solid 2: Sons Of Liberty (5 out of 5)
Metal Gear Solid (5 out of 5)
Bioshock (5 out of 5)
Uncharted: Drakes Fortune (4.5 out of 5)
Grand Theft Auto: Liberty City Stories (4 out of 5)
Star Wars: Renegade Squadron (4 out of 5)
Far Cry 2 (4 out of 5)
Resident Evil 2 & 3 & 5 (5 out of 5)
Silent Hill 1,2,3,5 (5 out of 5)
Rez (5 out of 5)
Zone Of The Enders (5 out of 5)
Army Of Two (4 out of 5)
Team Fortress 2 (5 out of 5)
Portal (Still Alive out of 5)
Call of Duty 4: Modern Warfare (4 out of 5)
Call of Duty 5 World At War (5 out of 5)
Dead Space (4 out of 5)
Warhawk (4 out of 5)
Guitar Hero World Tour (4 out of 5)
Rock Band 2 (5 out of 5)
Mirrors Edge (5 out of 5)

Least Favorite
Killzone 2 (3 out of 5)
Legendary (2 out of 5)
Noby Noby Boy (3 out of 5)
Nightcaster 2: Equinox (0 out of 5)
GTA IV (3 out of 5)
GTA: Vice City Stories (3 out of 5)
Astro Tripper (2 out of 5)
Fracture (3 out of 5)
Mercenaries 2: World In Flames (2 out of 5)
F.E.A.R. 2: Project Origin (3 out of 5)
Zone Of The Enders: The Second Runner (2.5 out of 5)
Rock Revolution (1 out of 5)

I agree with most of your lists, except for Killzone 2.  It's been a great game for me.

Mercs 2 was a steaming pile that gave me hemmrhoids just being in my PS3.  lol

I agree that FEAR 2 sucked. FEAR 1 was so much better I was so let down by the sequel.

your lists are good except for killzone 2 and gta4 being in the least favorite games list