The things about Norton don't actually surprise me. On my old computer, we used Norton IS. Version 2006 was slow, 2007 was a bit better, but not much. However, 2008 actually used less RAM, and scanned much faster. The down side is that the computer had so many other problems at the time, it didn't even finish the year 2008.
Our new computer now has McAfee, but I also have ClamWin Portable for my own weekly scans. Due to the way I use ClamWin, it's flaws don't really apply. Either way, McAfee hasn't been too bad, but holds it's own pros and cons to me. I mean, it has a lot of nice features. However, there have been a few trojans that only ClamWin picked up, and that kinda upsets me. Can't complain too much though, as McAfee is free with our Comcast internet.
Like others, I am actually surprised the Kaspersky was so lowly rated. With the exception of this review, I've only heard good things about it. This definitely makes me reconsider future computer security plans ...