The term “MLM company” isn’t exactly accurate because the company is not necessarily defined by the fact that it uses a multi-level marketing structure. Instead, a good MLM will be a product-centric company, meaning that it will be, for example, a cosmetics company that uses an MLM structure. Test the product of the company you are interested in; the product must be something that you would willingly advertise even if you weren't working for the company.
I totally agree, Mary. You can lose soooo much more just by opening up a small storefront business. I was in the Spa Industry and then the economy tanked in late 2008. I did not renew my lease in 2009. Lost my several hundred thousand dollar build-out. Lost so much more than taking an MLM business seriously. Even if I would have front loaded on a ton of product, I still would have been better off. People spend $750 and get some business cards then do nothing and blame MLM.