I noticed that as well. Sucks that the controls are screwed up. I mean that's the main reason to get this game for Wii U. The motion controls. And right now they are just screwed up.
I found that just being more careful helps, but it takes effort to not go shooting at the sky. I hope they get us that MW3 accuracy back. Surely it can't be too hard to convert the code from one console to the other. I mean the controllers are the same. They want them to do the same thing. Shouldn't be difficult.