I had similar issues too when I tried it for the first time on a Mini Pro. It was refusing to power down when connected to a charger, the charger was doing weird things too. I think that is sorted in newer builds (and for newer phones).
My biggest gripe with Cyanogen is Bluetooth, followed by GPS. Bluetooth was just not usable neither on my Arc, nor on my Nexus 7. Dropping connections, interrupted audio, etc.
GPS was working. Sometimes. Other times it was showing a systemic error of 200m west from where it should have been which could be resolved by one or more soft restarts - not something you want to do while driving and getting directions.
I still run the Arc with Cyanogen as it is the only way of keeping it up to date (it will run out of app space with its factory build + updates), but I had to give up on it as a primary phone as you could not use it for navigation.
So, may I suggest an addition to El Reg battery of tests (especially for Cyanogen): GPS (multiple application starts), Bluetooth (including battery life with bluetooth on).