CoD is released yearly, with essentially what boils down to being a moderate gameplay patch for an MP engine and a map pack. Rather then simply release a patch (free) and a map pack (DLC pricing), they throw in some brief campaign that usually steals wholesale from action B-movies, with a couple of gimmicky bits (Dogs, wingsuits, etc) used only in the campaign once or twice and discarded.
With the exception of Majora's Mask, I'm pretty sure every Zelda has been on an entirely new engine, and while they tend to have gimmicks to them, they certainly get more use out of them then the CoD thing of the year. They also aren't regurgitated every year, and you don't get the impression that you're playing Zelda v1.14 as a sequel to Zelda v1.12
With the exception of Majora's Mask, I'm pretty sure every Zelda has been on an entirely new engine, and while they tend to have gimmicks to them, they certainly get more use out of them then the CoD thing of the year. They also aren't regurgitated every year, and you don't get the impression that you're playing Zelda v1.14 as a sequel to Zelda v1.12