Well, if we take into account that AMD's APU's performance can be hindered due to the premise they operate on 'modules' instead of 'cores', a 4 module APU appears to be very much equivalent to a 2 core Intel i series cpu.
The Jaguar APU in PS4 however seems to utilize separate 'cores' (not modules), so I'm not sure just how much that will translate to performance increases (its possible it will affect it in a positive capacity).
I've also read some interesting news on Steamroller.
Should it deliver on what's being said (45% performance increase), then it can easily match/surpass what Intel offers across the board.
Having said that, AMD's higher end desktop APU's seem to approach/match more or less Intel's i5 entry level offerings (the ones with 4 cores/4 threads) in raw CPU power, but readily surpass it in GPU performance.
And if Steamroller delivers, then APU's based on it could produce much better results.
In multithreaded software, APU's seem to hold on their own most of the time, but I agree that Intel has them beat in numerous situations (still, keep in mind that APU's were designed to take advantage of GPGPU, whereas a lot of software doesn't do that - which tips the scales in Intels favor, whose IGP solution doesn't really thrive in OpenCL).