Is that because of the strange behavior it causes on your machines where heavy network traffic grinds the system to a halt?
FWIW I'm not seeing that behavior myself....
View attachment 239886
Under relatively heavy network traffic, Kaspersky network scanning does use a sizable amount of CPU on this Core i7 device, but it's still less CPU usage than Chrome.
Note that network scanning in general is very CPU intensive, and if you have a Ultrabook style laptop it is going to significantly reduce your battery life when you're doing heavy networking. But in terms of overall system load, Kaspersky is barely perceivable for me.