thats far away from being correct. I use wine and cedega. And from my experience i have to say:
Installation: Wine is much superior to cedega
Graphics: Games in cedega look much better than in wine. I played CNC3 with wine and cedega and i have to say it looks MUCH better in cedega. I can push every settings to max in cedega without probs. Same settings give me tones of graphical glitches in wine. So the dx implementation of cedega is much more "correct" in my eyes. Or try to play NFS Prostreet Demo with wine and compare to cedega. Then you will know what i mean.
Sound: Sound works great for me in cedega and still slightly better than in wine.But wine improved much with the latest releases.
CopyProtection: correct that this is not wine's fault, but cedega is superior here
So both , wine and cedega, are far away from being perfect. But from my
point of view, if a game is supported in cedega in outperforms wine in 99% of all cases.