I think what Rashkae is saying is a general statement that's all. No need to dig out all those reviews la.
People who have been into digital photography knows that, in general, a smaller sensor will result in lesser capabilities in things like signal-to-noise ratios, image quality, or whatever.
The final image that comes out of it will also depends on the processor of the camera, all those noise reduction algorithm and blar blar blar.
So if one were to compare cameras, it is still better (IMHO) to look at them individually, as well as keeping in mind the pros and cons of each system (e.g. crop factors, sensor sizes, form factors, controls, lens selection range, etc).