I would say MGS4.

Oblivion and Halo for me, I tried to get into those games but I never understood the love for them.

My guess would be October/November of 09'
If that's the case we should be getting at least one update in the coming month or two.

Top 5 for me, but definitely not #1

I came back to RE4 three or four times. I've beat it more times than I can remember.

Best game I've ever played is probably RE4, best game on the 360 is between Gears of War 1 and maybe the Orange Box? If that counts.

Definitely Wesker for me.

Its been a while since a game has truely "scared" me, I would say the last time was in FEAR, there we're several moments.

I still havent played condemed, Silent Hill HC, a few others, and I still want to play FEAR from start to finish.

Definitely Gears of War 2, at least recently.

Kingdom Hearts I
Kingdom Hearts II
RE4

You can also now add RE5 to that list.