I have to agree, Killzone 2 is the only AAA FPS that actually runs in HD resolution, both Halo 3 and CoD:MW run in a sub-HD resolution.
- Killzone 2, 1280x720 @ 30fps, x2 QAA
-CoD:MW, 1024x600 @ 60fps, x2 AA
-Halo 3, 1152x640 @ 30fps, no AA
Killzone 2 is a given that it does x2 QAA algong with being a HD game, it is a 1st party game after all, so it was expected.
CoD:MW does redeem it's self because it at least runs at 60fps with x2 AA to boot, and since it's a 3rd party multiplaform game, they are restricted in how much they can optimise thier engine for any given console, but they did good with that limitations/
Halo 3 disappointed in all technical respects, they are 1st party and so should have been able to really push the 360 to the max, but what resulted from a 1st party games was a game that not only ran at a sub-HD resolution but had no AA at all...it could of redeemed it's self like CoD:MW but Halo 3 only runs at 30fps.
Now with all the above said, all these games are good in the type of fun they deliver, the only draw back to some where the technical limitations they had.