Xander,
Guess you haven't used NIS/NAV 2009, 2010. The performance is impeccable. NIS is top notch and in the top 2/3 in any test out there. NO OTHER PRODUCT HAS THAT LEVEL OF CONSISTENCY.
So what kind of resources does it use now?
Oh and just to be sure I wasn't thinking of old information I did a quick google search on top anti virus and norton got either a B grade or 9th place on two top lists I found. It seems that the testers think that Norton is better than before but the customer service is still rubbish. Now personally I've used Norton at work up until I think 2007.. and though I can't actually fault it as an anti virus it decided that it knew best, took over the computer to the point you could do anything without it's permission and then required a new tool to remove it. In fact my sister still has Norton on her laptop, the removal tool won't install and it ate Avast. My theory is, any company which charges more than it's competitors, habitually, should have the decency to produce a product of quality from day one. They failed. In my book they have ground to catch up and this "but we're as god as them" does nothing.
I mean there's little difference in between top anti virus in terms of what it will and won't catch. Most people will go a long while without getting viruses anyway... unless they're pirates or live in facebook or similar. So really with antivirus you should choose one of the top performers but which one depends on personal preference, cost and other such things. Now personally I'm not going to pay more to get Norton and I advise other's the same.
Should Norton produce a nice small, non intrusive package that allows ME to control MY computer (note my computers are there to serve me and never the other way around) and perhaps has side advantages like better firewall configuration or even automated stuff (I used to love systemworks) then I may change my mind but until then they're still the company which leaves registry entries all over the place cause they can.
Grade "Nice attempt but must work harder" C+