Norton Sucks.
That is all.
Seriously, every company has strengths and weaknesses. Everybody seems to think that their personal selection is the best and takes any argument as a personal attack against themselves.
I personally, used to love Norton. I used them up until around 2000, but soon was disappointed with what they were offering.
I then tried and used many of the other competing products. Some I really liked at the time, such as Trend Micro and Kaspersky, and some were not very good such as McAfee and BitDefender.
In the last several years, I discovered, that very few companies tend to have a superior product every revision. Without a doubt, some are better than others.
Some products have a high detection rate, but are bloated or buggy. Some have just a decent detection rate, but are well written and do not crash your system.
Sometimes, you just have to read user reviews, detection rates from review sites, and simply download and try the product before you buy it.
With, that said, I recently read about how Symantec had really turned around their product over the last couple of years. When my Kaspersky license expired, I downloaded and tried Norton Internet Security 2009 on my laptop and was really pleased on the speed and design of the program. It used much less resources than Kaspersky 2009 Reviews show it to be on par with Kaspersky's detection level, so I am pleased with it.
My only complaint about Symantec at this point: I wish they would offer a 30 day trial (like most of their competitors do), instead of 15 days.
That said, just try a product before bashing it and have an open mind.