Everything's better on Cod4, but you guys should try mastering the Intervention acog because it's nasty.
Ive tried using it and I prefer the thermal as its pretty fast and seems more accurate. But yeah cod4 is better in some ways, but MW2 has all that nice new stuff, really IW just needs to add a playlist where there are only 3-5-7 KS/s because that will make me stop going back to cod4.