Well, there are alot of half truths in those reports..
i have it installed on a couple of my machines and i will give you my honest opinion..
-It works well providing you disable the excess bloat like recycle bin protecting, and those bloodhound scans, also disabling a couple of the services in the msc snap in.
-The activation in 2004 is a tedious measure that will need to be redone if you change hard drives or partition the hard drive(which was surprise to me)
-I have to disable it to burn a cd, although cd burning still will work, the caching of files has excessive lag and things go faster with the scanner disabled.
-6 running processes visible(after i set options and disabled hal of it)also 7 found services under "services.msc"
-Yes it's a disaster to reinstall, what symantec product isn't?
-You will notice the drag of resources when it is running, I have production machines I would not install this on due to the huge demand of resources.
-For a user that is not computer savvy, and uses the Internet for email, web browsing, or sharing files..this Nortons will suit them well, it updates itself, and can make decisions for the user like deleting files automatically, although they will get a popup box stating an action has been taken, but no input from them is required other than closing the dialog.
-For users that are into high end gaming, cd/dvd burning, video rendering... if they know how to disable the scanner while doing these tasks, it is still ok, although even while disabled those running processes are still present.
It will keep you protected, and if resources are not an issue this is one good scanner.
Would I install it again?? probably not, the nortons corporate edition looked a little more resource friendly... and I would have to agree with your AVG non-preference.