Did some experimenting with 2x SSAA in CoD Advanced Warfare (because if you can spare the performance, why the hell not?) and to be blunt, the in-game 2x SSAA setting sucks. To put it simply, it's 2x1 SSAA. (whereas most games, that I know of anyway, that have a native SSAA feature do 2x at 1.41421x1.41421. (which would actually be around 1.999x SSAA)
As such, you want GOOD 2x SSAA in Advanced Warfare? Downsample.
And yes, I had nothing better to do while performing this little experiment.