I'll just go with my PS3 since that's my main gaming machine.

PS3:
Assassin's Creed - 81
Assassin's Creed II - 91 
Batman: Arkham Asylum  -  91
Burnout Paradise - 87
Call of Duty: Modern Warfare 2 - 94
Dead Space - 88
Devil May Cry 4 - 84
Dragon Age: Origins - 87
EyePet - 70
Fallout 3 - 90
God of War Collection - 91
Heavenly Sword - 79
inFAMOUS - 85
Killzone 2 - 91
LittleBigPlanet - 95
Metal Gear Solid 4 - 94
Mirror's Edge -  79
Motorstorm: Pacific Rift - 82
Ninja Gaiden Sigma 2 - 83
Prince of Persia - 85
Ratchet & Clank Future: ToD - 89
Ratchet & Clank Future: ACiT - 87
Resistance 2 - 87
Tom Clancy's EndWar - 76
Uncharted: Drake's Fortune - 88
Uncharted 2: Among Thieves  - 96
Unreal Tournament III - 86
Valkyria Chronicles - 86
Mean: 83,46

PSN:
.detuned - 46
Bionic Commando Rearmed - 87
Burn Zombie Burn! - 76
Critter Crunch - 87
Flower - 87
Noby Noby Boy - 75
PixelJunk Monsters - 83
PixelJunk Shooter - 86
Rag Doll Kung Fu - 68
Ratchet & Clank Future: QfB - 76
Super Stardust HD - 85
Trine - 83
WipEout HD - 87
Mean: 78,92

Mean (PS3+PSN): 81,19

I'm pretty satisfied  

AAA collection, no less.

My Xbox 360 Games:

Borderlands - 84

Bully - 80

Call of Duty 4 - 94

Call of Duty 6 - 94

Crackdown - 83

Dragon Ball Z: Burst Limit - 72

Dead Rising - 85

Far cry 2 - 85

Fifa 08 - 82

Fight Night Round 3 - 86

Fuzion Frenzy - 49

Guitar Hero 3 - 85

Grand Theft Auto 4 - 98

Halo 3 - 94

Halo 3: ODST - 83

Kane & Lynch - 65

Left 4 Dead - 89

Medal of Honor: Airborne - 73

Need for Speed: Most Wanted - 83

The Orange Box - 96

Perfect Dark Zero - 81 

Prey - 79

Rainbow Six: Vegas 2 - 82

Saints Row - 81

Soulcalibur 4 - 85

Splinter Cell: Double Agent - 85

Lego Star Wars: Complete Saga - 80

Star Wars: Force Unleashed - 73

Unreal Tournament 3 - 82 

Average = 82.34% 

Ill add my XBLA and PS3 List after.

Here is my list, it's a bit long...

Wii:
Legend of Zelda TP 95
mad world 81 ny
mario kart wii 82
metroid prime trilogy 91
NSMB Wii 87
okami 90 ny
punch-out 86
residen evil 4 wii ed 91
Super mario galaxy 97
super paper mario 85 ny
SSB brawl 93 ny
wii fit 80
Wii sports resort 80
world of goo 94
-----------------------------------
X360:
Assasin's creed1 81
Assasin's creed2 91 ny
Gears of war1 94
Gears of war2 93
Forza motorsport2 90
Forza motorsport3 92 ny
Lost planet 79
Perfect dark zero 81
Soulcalibur 4 85
Viva pinata 84
----------------------------------
Ps3:
little big planet 95
metal gear solid 4 94
ninja gaiden sigma 88 ny
Tekken 5 DR online 81
uncharted 88
virtua fighter 5 85
----------------------------------
DS:
Brain age 77
GTA cinatown wars 93 ny
Mario&luigi 3 90
Mario Kart DS 91
New super mario bros 89
Trauma center 81
Trauma center 2 79 ny
Zelda phantom hourglass 90
Zelda spirit tracks 87
----------------------------------
PC:( this generation)
Bioshock 96 ny
Braid 90
COD4 92
Dead Space 86
Fallout 3 91
Half-Life 2 96
Pro Evo Soccer 2010 78
Resident Evil 5 86
Spore 84
UnrealTournament3 83 ny
----------------------------------
Partials:
Wii 88
X360 87  
Ps3 88.5
DS 86.3
PC 88.2
---------------------------------
Total:                         87.6

Just doing it with my PS3 collection, including other platforms would be too much hassle :

Heavenly Sword : 79

Uncharted : 88

Uncharted 2 : 96

Killzone 2 : 91

Motorstorm : 82

Resistance FoM : 86

Ratchet & Clank ToD : 89

Ratchet & Clank aCiT : 87

GT5 Prologue : 80

Singstar : 82

Eye of Judgment : 75

Infamous : 85

Folklore : 75

Virtua Tennis 3 : 70

Buzz Quizz TV : 80

PES08 : 74

Naruto UNS : 75

Soulcalibur 4 : 85

Warhawk : 84

Yakuza 3 : 83

Metal Gear Solid 4 : 94

Valkyria Chronicles : 86

Final Fantasy XIII : 87

Demon's Souls : 89

Assassin's Creed : 91

Gran Theft Auto 4 : 98

LittleBigPlanet : 95

Average : 84.66

Man, I have too many games to bother checking the scores, including a lot of older ones that probably don't even have reliable online scores. But I know they're all very good anyway, I don't buy crappy games I don't like.

LOL anyone dare wanna tackle my list of games?

My list would take up about five pages of this thread.

My games list from spectacular to awful according to metacritic and deservedly so.

230 games.... Ill do this when I get home : p

Only going to go through my current generation stuff:

PS3 - 87.5

• Batman: Arkham Asylum - 91
• Dead Space - 88
• Demon's Soul - 89
• Ghostbusters: the Video Game - 78
• Killzone 2 - 91
• LittleBigPlanet - 95
• Naruto: Ultimate Ninja Storm - 75
• Resistance: Fall of Man - 86
• Resistance 2 - 87
• Uncharted: Drake's Fortune - 88
• Uncharted 2: Among Thieves - 96
• Valkyria Chronicles - 86

Wii - 82.1

• Boom Blox - 85
• de Blob - 82
• Excite Truck - 72
• ExciteBots: Trick Racing - 77
• Ghostbusters: the Video Game - 76
• Madworld - 81
• Mariokart Wii - 82
• Mercury Meltdown Revolution - 77
• Metroid Prime 3: Corruption - 90
• Metroid Prime: Trilogy - 91
• New Super Mario Bros Wii - 87
• No More Heroes - 83
• Okami - 90
• Pikmin - 77
• Punch-Out!! - 86
• Rayman Raving Rabbids - 76
• Rayman Raving Rabbids 2 - 67
• Rayman Raving Rabbids: TV Party - 73
• Resident Evil 4: Wii Edition - 91
• Sam & Max: Season One - 74
• Silent Hill: Shattered Memories - 76
• Super Mario Galaxy - 97
• Super Paper Mario - 85
• Super Smash Bros. Brawl - 93
• House of the Dead: Overkill - 78
• The Legend of Zelda: Twilight Princess - 95
• Wii Fit - 80
• Wii Fit Plus - 80
• Wii Sports - 76
• Wii Sports Resort - 80
• Zack & Wiki: Quest forr Barboros' Treasure - 87

Xbox 360 -  85.2

• Alone in the Dark - 58
• Bayonetta - 90
• Bioshock - 96
• Borderlands - 84
• Call of Duty 4: Modern Warfare - 94
• Call of Duty: Modern Warfare 2 - 94
• Dead Rising - 85
• The Elder Scrolls IV: Oblivion - Game of the Year Edition - 94
• Eternal Sonata - 79
• Fable II - 89
• Fallout 3 - 93
• Gears of War - 94
• Gears of War 2 - 93
• Ghostbusters: the Video Game - 79
• The Orange Box - 96
• Left 4 Dead - 89
• Left 4 Dead 2 - 90
• LEGO Star Wars: The Complete Saga - 80
• Lost Odyssey - 78
• Madden NFL 09 - 83
• Madden NFL 10 - 85
• Mass Effect - 91
• Mass Effect 2 - 96
• NCAA Football 10 - 83
• Red Faction - 85
• Saints Row 2 - 81
• Sneak King - 54
• Sonic's Ultimate Genesis Collection - 79
• Star Wars: The Force Unleashed - 73
• Street Fighter IV - 93
• Viva Pinata - 84

Total - 84.3

Damn, that took a while, glad I agnored everything else.