Hmmm hard to   choose just 5 so im going to list the ones I feel I played the most so in no particular order

1. Warcraft 2

2 monkey island 1-3

3 goldeneye 64

4 company of heroes

5 ocarina of time

ALmost added perfecf dark,banjo kazooie,gta 3, metal gear solid (ps1), shenmue,zombiu and sm3dw to name a few

I give you top 6:

6. COD Modern Warfare 2
5. COD Ghosts
4. COD Black Ops 2
3. COD Modern Warfare 3
2. COD Black Ops Declassified
1. COD World at War

1-age of empire 2
2-prince of persia : sand of time/the two thrones
3-assassin's creed 1/2
3-age of wonders :sm
4-splinter cell : pandora tomorrow
5-red alert/gta:san andreas

5. ) Metal Gear Solid (PS)
4. ) Super Smash Bros Melee (GC)
3. ) Metroid Prime (GC)
2. ) Unreal Tournament (PC)
1. ) Super Mario 64 (N64)

1 Uncharted 2 (PS3)

2 MGS2 (PS2) I think overall MGS3 is the better game, but MGS2 had a much bigger impact on me.

3 God of War 2 (PS2)

4 Conker's Bad Fur Day (N64)

5 Smash Bros. Melee (NGC)

Those were my top 5.

Honorable mentions would be ...

MGS3
Persona 4G
Devil May Cry (original)
Street Fighter 2
Tekken 5

1. Okami.

2. Red dead redemption.

3. Super mario galaxy 2.

4. Uncharted 2.

5. Stronghold (2001).

lol Funny. xDDDDD

5. Final Fantasy
4. Age of Empires 2
3. TimeSplitters 2
2. Final Fantasy X
1. Streets of Rage 2

I don't think I can give an accurrate top 5 off the top of my head, but this is the best I can do on the fly. I mean, Valkyria Chronicles and 999 are in there somewhere...

The Longest Journey

Mass Effect Trilogy

Civilization Series

Bayonetta

Resident Evil

Soooooooooooooooo tough to pick... Here goes....

5. Street Fighter 2 (Arcade/SNES)
4. Advance Wars 2 (GBA)
3. Streets of Rage 3 (Mega Drive)
2. Resident Evil 4 (GameCube)
1. Legend of Zelda Ocarina of Time (N64)