Barely protecting you while charging a lot for useless "full version"
Harming computer by blocking important programs (Start Menu, Cortana etc.)

Honestly, we need all the antivirus companies (except Malwarebytes) thrown out the window.

well. some are crap and super cheap (free) but some antivirus programs are actually good.

1. because you barley see them

2. they know what is on the computer you are using.

3. they update all the time.

anything else should be deleted.

May I be honest? I dont use any antivirus programm at all. The disadvatages (heavily reducing your PC-power and the annoying messages when there is no threat at all overweight the advantages.)