I have yet to be in a code window, select an method or property name, and have help come up with anything remotely close the the word I'm searching on. I guess Google knows something Abobe needs to learn.
I shut off AIR, and every time I get AIR help topics that don't relate to the code I'm working on.
No much of an improvement, if any, over CS4.
I personally think community help is a good step in the right direction, it might be a bit premature up to this point, best thing I can recommend you is going through google, search for whatever class "livedocs". that should lead you instantly to the right page.. there are as well workarounds in the Flash IDE, but I'm not 100% sure if they work on every machine.