Is avira antivir personal good or bad? some say this is the worst free antivirus?

Avira is ok but comodo is probably rubbish... never even heard of it lol. Avira and Avast are probably the two best free antivirus programs, Avast is probably better if you know what you are doing, but if you don't really know what you are doing 100% maybe you should stick with Avira.