From those, mexican standoff and then mad world, also, i would like to agree other, maybe, my favorite

Bioshock, i can see this tv commercial every day.

I like the Mexican Standoff and Mad World.

mexican standoff, mad world, and i don't think you had this one posted but rendezvous

Guitar Hero 2 - Ouendan and Elite Beat Agents should sue.

Lost Odyssey - One of the worst things I've ever seen.  Maybe if they had used the game's actual music instead of that wailing crap it wouldn't be a crime against humanity. 

Halo 3 Museum- Redefines the word cheesy.

Halo 3 Starry Night - Oh god make it stop.

Halo 3 Believe - Halfway to decent.  Not all the way, but halfway.  

Gears 2 - Actually pretty good, but not as good as the next one.

Gears - Love this commercial.  Great use of a great song, with great atmosphere. 

Mexican Standoff - What. The. Fuck.

Cops and Robbers - See above.

The fact is though that there is only one RIGHT answer to this question.  And it is this:

Gears 2 Rendezvous or Bioshock.  Both hella good

Mad World takes it by storm. But if they made Randezvous with Death into a commerical, then.. wow.

Naz is correct.

Objection!

Not a TV commercial...

Hold it!

It's an extended verison of a TV commercial, which you did to add the LO entry anyway.  Precedent is established, and therefor it's fair game. 

The Halo ones won ad awards