PS3:

1. UNCHARTED 2:AMONG THIEVES

2. KILLZONE 2

3. INFAMOUS

4. CROSS EDGE

5. GHOSTBUSTERS

6. CALL OF DUTY CLASSIC

7. SACRED 2:FALLEN ANGEL

8. BLAZEBLUE:CALAMITY TRIGGER

XBOX 360:

1. STAR OCEAN IV:THE LAST HOPE

2. MAGNA CARTA 2

3. LEFT FOR DEAD 2

4. HALO 3:ODST

5. NINJA BLADE

NINTENDO WII :

1. VALHALA KNIGHTS:ELDER SAGA

2. CONDUIT

3. KLONOA

4. METROID PRIME TRILOGY

5. MURAMASA:THE DEMON BLADE

6. DEAD SPACE:EXTRACTION

 these are my favorite games so far that i played this year for these systems.

PS3:

1. Uncharted 2

2. Ratchet & Clank: ACiT

3. Batman: AA

4. MW2

5. KZ2

PS3:
Demons Souls

ds doesnt count? if not then...

ps3
lbp
...I just brought it and still needs to buy more games...

wii
nsmbwii
smg
metroid prime triology
world of goo
lostwinds
the legend of zelda twilight princess
wario land shake it

Here goes, i'll just do top few for each system. Oh and only exclusives. I'll do a separate top multiplat one

PS3:

1. Uncharted 2

2. Killzone 2

3. Ratchet and Clank Future: An Ass Crack In Time

4. God of War Collection (yeah I know PS2 port, but still)

5. InFAMOUS

360:

1. Forza 3

2. Left 4 Dead 2

3. Grand Theft Auto DLC

4. Halo 3 ODST

5. (No 5th game)

Wii:

1. New Super Mario Bros Wii

2. Punch Out!!

3. Little Kings Story (never played it, but it looks okay)

4. Mad World (not my thing, but props for being super violent)

5. (no 5th game)


Multiplat Games:

1. Modern Warfare 2

2. Assassin's Creed 2

3. UFC 2009

4. Fight Night Rd. 4

5. Madden 10

Well I think you only count 2009 releases rrrrrright ?

If so, then:

360:
1. Assassin's Creed 2
3. Fallout 3 GOTY
4. Resident Evil 5
5. Batman Arkham Asylum
6. GTA Episodes from Liberty City
8. Borderlands
10. Halo 3 ODST
11. DiRT 2
12. NFS Shift
13. Left 4 Dead 2
14. Forza 3
15. Red Faction Guerilla
16. Halo Wars
17. FIFA 10
18. FEAR 2

PC:
2. Modern Warfare 2
20. Secret of Monkey Island Special Edition

PS3:
7. Uncharted 2
9. Infamous
19. Killzone 2

PS3:

Resident Evil 5

Xbox 360:

Resident Evil 5

Wii:

I guess I would have to say Wii Sports, still the best game on the system IMO.

DS:

GTA: Chinatown Wars

PS3:

Uncharted 2

360:

Resident Evil 5

Wii:

New Super Mario Bros. Wii

DS:

Mario and Luigi: Bowser's Inside Story

PSP:

Dissidia

PC:

Plants vs. Zombies

360
GTA: Liberty City Stories
PC
Aion

PS3:
1. Uncharted 2
2. inFamous
3. The Saboteur
4. Demon's Souls
5. Red Faction: Guerilla

Wii:
1. New Super Mario Bros. Wii
2. Tales of Symphonia: Dawn of the New World
3. Metroid Prime Trilogy
4. The Conduit

But to be fair, I've played maybe 5hours of MPT. I've beaten MP3 as stand alone and only played a little of MP1 here.