I can't speak for MW2 to MW3, since I didn't play MW2. So, I'll have to take your word on it, in which case, I can agree. Asset reuse is pretty silly.
However, since MW2 and MW3 don't have the exact same campaign taking place in the exact same locations, I can't really see how one is just a copy of the other. Conceptually, perhaps. Run here, shoot guys, ride that turret, etc.
Keeping a consistent look across several games doesn't seem like a bad thing, unless you make it into one.
BFBC2 and BF3 - I could make a joke about their box covers, but that's more EA's fault. I get what you're saying, but again, you're coming from a hostile critic's standpoint. Gameplay wise, Blops and MW3 feel totally different, they're completely different games to me. They're different devs, so that makes sense.
Beyond that, I got no strong opinions, since I didn't play WaW or MW2.
Which leads me again to, it seems the people who oversaturated themselves with the series, are the ones suffering from fatigue of it. Time to play something else, I guess?
I was paraphrasing. Many people in this thread have eluded to every CoD just being a new skin on an older CoD. Which just isn't true. I have no allegiance to any particular franchise, but I do wonder about how vehemently some people will denounce one. It just comes off as borderline pathological.