Any review from a magazine such as PC World and others of its ilk are to be suspect in the least!
So far as any place that I would trust of reviewing AV or IS applications would be:
www.av-comparatives.org
There are a couple of other websites also, but av-comparatives does an excellent job and keeps their results updated on usually a quarterly basis.
Also, contrary to some popular opinion, nothing... I mean nothing made, designed, created or whatever by a human being is "perfect". It is inherently flawed because humans are flawed. So to state that a program is perfect is somewhat fallacious.
Some AV software works extremely well and with little user input or action, while others are more demanding and can be a royal pain in the rear. That's why there's the free market so the consumer may decide what works best for their own particular situation.
The two best AV or IS programs I have ever used and neither one EVER caused ANY issues whatsoever are: ESET and G DATA. Both are VERY user friendly, very efficient, fast and do their job they're designed for. Yes, these are programs which one must purchase, so be it. The both have their little flaws and quirks which some may find annoying, others wouldn't.
In the end, it's the end-users choice to decide what works best for them. That's why the majority of AV and IS applications give usually a minimum of a 14 to 30 day trial period.
However, we could continue to argue about which AV application is the best until First Contact is made! These always remind me of the arguments theologians had back in the Middle Ages, trying to decide how many angels could dance on the head of a pin.