Why i think call of duty is shit.

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If we ignore Cod2 and 4's progress as I was referring from after 4 that's not a whole lot changed other than World at War, hell, they added the same technology twice and we don't even know if Black Ops 2 will keep those features, games have promised before technologies that never made it into the actual game. (fable)
A couple of lighting tweaks and texture streaming (added twice, wut) isn't what I'd call major changes, and in terms of what you can actually see, yes, it effectively is, hell, it was proven by Palistov screenshots earlier, the scenery (buildings forest both barely changing in terms of texture, quality etc).

Infact, quite a few of the features that are anywhere near major were added recently when other engines have had them for years.

Back in 2004 when Valve said they were going to utilize HDR technology in Half-Life 2 it was big news and they even created a new mod just to show it off. Not the first to do it but I am fairly certain it was a first for a 3D game.

CoD may be late to the party when it comes to some of these advanced lighting features but that doesn't mean it isn't complicated to implement them and they did it on an engine that didn't support them natively.

P.S. The reason why they introduced texture streaming twice is because if you look closely Black Ops actually uses the World at War IW 3.0 engine, now IW 4.0. As I said, I'm not a fan of Infinity Ward at all, but I recognize that the new CoD games are well made.