If you can sort out a point-n-shoot camera with a flash you'll get far better results. The low-res cameras intended for web cam use are useless for this job, their resolution and colour balance are totally shot-at, even with good lighting. I usually use an old 3 mega pixel camera on a lightweight tripod, using the self-timer. I've no real complaint about the results.
Remember too that the mirror reverses your image left-right. We get used to seeing our reflections like that and things look "wrong" when we see ourselves as others see us.