I'd say its a mixture of deja vu and business as usual. COD being a prime example seeing last gen it ran at funny resolutions and some varied framerates!
Last gen a lot of games (I'd wager the majority, but I don't have the numbers) ran at odd sub-HD (below 720p) resolutions. It wasn't a major thing that was discussed in mainstream gaming press, and as such wasn't really a big thing talked about by many gamers (NeoGAF probably being an exception to this as I believe there was performance discussion last gen (even if it was to a lighter degree than it is now)).
Performance has become a bigger talking point this generation, and there are a number of factors that have been cascading together over the last few years to make that happen (e.g. more people have HD TVs now, things like Digitial Foundry becoming big and shining the light on technical performance of games, the power difference between the consoles this generation being a bit easier to understand, etc.).
These discussions were around last generation, but weren't front-page-of-IGN kind of things like we've seen this generation.
On topic, it's a bit surprising to see such drops in both versions considering how well AW performed last year on each. I guess different devs is a big reason, but you'd still think there'd be a fair amount of engine optimization sharing going on between all COD devs...