Do BF4 and AC4 even look that much better on next gen? I dont think so. I saw a video of AC4 PS3 vs PS4, and other than being a little sharper there was almost no difference. Your mom sure as hell wouldn't be able to tell. (here is that AC4 video) http://www.youtube.com/watch?v=HIHH_PNwcVE
I havent checked it out yet but I fear the same for BF4.
Then we have BF4 at 720P on X1...uggh. Same resolution as last gen.
Yes I am aware of all the usual caveats, that next gen will improve over time etc. It's still sort of surprising to me, personally.
It seems the"knee of the curve" as they say, on graphical diminishing returns, may have been the PS360 gen, in retrospect. I think every prior gen clearly showed huge increases (think about it) but PS360 to PS4/X1 is showing a lot of dimishing returns so far...