How about instead of laughing you explain why MW2 is better.
Here is why I think WaW is better:
1. WaW had a more consistent single-player campaign (which also had 4 player co-op, whereas MW2 didn't). It never resorted to retarded plot devices such as Russia invading USA, or CSI levels of technobabble bullshit when transitioning from one shitty plot device to another. WaW kept it all real, and even got a little emotional at times. It finished on a high-note too rather than some shitty cliffhanger that we'll never know the true conclusion of. Cleansing the Reichstag of Nazi scum was one of my favourite gaming experiences of 2008.
2. Better multiplayer. Thanks to the beta, Treyarch tuned it to near perfection, and continued to do so for months after release. Glitches were eliminated faster than in MW2, weapons nerfed more effectively, and..... you know, fuck the politeness: it didn't have any fucking bullshit like nukes, care packages or Javelin glitches. Infinity Ward just went nuts with the kill streaks and broke any balance COD4 had. Treyarch also communicated with the fans a hell of a lot better than 402 ever could ("hey, i'm just going to use Twitter rather than the website we already have!").
3. Better post-game support. Patches actually had the fixes that were promised. We got a free map (Makin Day). Then we got another 3 map packs designed by Splash Damage, which were actually pretty good. Then add on Nazi Zombies, which shits all over Spec-Ops and supports 2 more players - even that got new maps and actually had a little ARG storyline built around it. Treyarch simply supported their game better than IW did.
4. The soundtrack in World at War was also better. It was more original. They weren't afraid to fuse techno and metal with a World War II setting, and I applaud that because it ended up working tremendously. The Black Cats and Reichstag set peices even more awesome because of it. And of course there were more traditional orchestral pieces to compliment this. Frankly, Hans Zimmer ain't got shit on WaW- it sounded as if he phoned MW2's soundtrack in.