MLM and pyramid scams : USANA scams or not

MLM and pyramid scams : USANA scams or not

Some people think Usana is a scam  : 

 A Review Of Why There Is A High Failure Rate 

http://kimtarr.com/2011/mlm-companies/usana-scam-review/

I think it is not a scam :

I checked BBB,org , The result is A+ . 

http://www.bbb.org/utah/business-reviews/multi-level-selling-companies/usana-health-sciences-in-salt-lake-city-ut-2000510