In general, MUCH better than how they sold on the Wii U.
CoD sold perfectly fine on DS and Wii.
And yet, no 3DS Call of Duty. Strange. We got a little iPhone spin-off but even that hasn't been ported over to a system that clearly has the install base to support on (although perhaps not the demographics, though the same could be said about DS and that still got a number of these games.)
Here is the complete list of the Treyarch port team for the Call of Duty: Ghosts Wii U port:
That's 38 people...not exactly "little to no effort" now is it?
It's a good number of people (strange that it still takes that many people these days to do a port, many engines do a good portion of the work for you) but it doesn't say their input on the project. They could have come and gone, they could have been working on it part-time, they could have gotten credit for minor contributions, they could have done the project in a short amount of time (I don't know COD Wii U's history, honestly.) If it really took 40 people to make this happen then sure, those results aren't worth it, but I wish we had better insight into the budget and timeline.
This literally happens with every Call of Duty game. It'll probably be announced months later by another Dev like the last few...
As has been pointed out, usually what happens is that Activision does the no-comment routine. This time, it's the developer, and although the CoD teams aren't exactly looped in on product plans (wasn't the chief CoD marketing staffer completely unclear on what the Vita game would be a few weeks before launch?), the fact is that Sledgehammer would have had to have given assets and information to a porting team for a Wii U version (unless it's a third team, with Sledgehammer making the main game and High Moon doing the port-down and team-3 doing the Wii U quickie? Or unless High Moon is just doing it and it was never discussed up the line, which I suppose is possible, but they didn't do cross-platform on Transformers Fall of Cybertron and that was while Wii U still had a 3rd Party market.) He is also saying outright that there isn't one, and it's rare for CoD team members to comment on the Nintendo platform plans at all so a firm "no" feels like it's pretty definitive. Still, Activision has done stranger things...