this was because these two were 'add ons', they weren't meant to be a new new COD, jsut an advance on the current generation, sort of like how Battlefield Bad Company 2 isn't Battlefield 3
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Why would you call it CoD7 instead of Black ops anyway, the same thing goes for people who call MW2, CoD6. The last one I would say it made sense to number was CoD4.
But anywho, the only good M16 was the CoD4 one, they've been toned down more and more since then, and I find the Black ops one to be really unreliable. Outclassed by the Famas in both MW2 and Black ops.