The only bugs left in the CM7 roms for the OV that I know of are:
1- camera:
aospCMod you have a choice of zoom or focus working but not both
ath3nos you have both functions, but zooming at 2x or 4x gives you a green strip on one edge of the pic
2- sound:
aospCMod you have issues with headsets (both wired and bluetooth), and with custom ringtones
ath3nos you have some bluetooth issues, wired headsets work but may require a volume change while using to keep working
Those are the two issue categories that affect most people. Most other issues that have been posted can be attributed to improper flashing, too high of an overclock, or there is a simple workaround.
The CyanogenMod team likes to have pretty much all the bugs worked out before an official release.