Best XBOX games new and old

Ok guys i saw this forum a few days ago and i was just wondering what peoples best 15 games on the xbox has been since it has came out to date.

Here is mine..(in no order mainly)

Call of Duty 4
Modern Warfare 2 (soon to be MW3 too)
Assassins Creed 1,2,3 (prob 4 as well)
Gears of War 1,2 (to be 3 as well)
Red Dead Redemption
Splinter Cell Conviction
Fallout 3
Rainbow Six 3 (original xbox)
Halo
Medal Of Honor(2010 or 2011 when ever it was out)
Mass Effect 1,2 (will be 3 as well)


Ok thats my list, i know there is only 11 but i didnt slightly cheat with sequals as well, and ive most probably forgotten some very obvious games, but im tired, so i can always add or change

In no particular order again:

Gears of War 1
Assassins Creed 1 + 2
Oblivion
Half Life 2
Portal
Ghost Recon : Advanced Warfare 1+2
Halo 2
Call of Duty 4
Modern Warfare 2
Fallout 3
Mass Effect 1+2
Rainbow Six: Vegas

Ive probs forgotten some which might be better but cant think of them just now

Don't think I have a top 15 but I'll see what I come up with...

In no particular order....

Cod4
Modern warfare 2
FIFA 12
FIFA 11
Guitar hero world tour
Splinter cell conviction
Gears 1 & 2
Medal of honour..the one about 4 years ago
Bioshock 1 & 2...1 was better though
Command and conquer
Simpsons!

I think that's about it!