One of the biggest mistakes a MLM "noobs" makes is put all the emphasis on the product, without analyzing the business model itself, i.e. the compensation plan, or in jargon, "comp plan". (Or perhaps there's only a cursory glance). They are all enthusiastic about the product. OMG, it totally works. I (blah blah blah blah), product is (blah blah blah blah). You have to try it! It's totally legit! I didn't believe at first but now I do! (blah blah blah blah)
When critics / concerned friends/family told them the company is likely a pyramid because of X, Y, and Z, the first thing out of their mouth is "it can't possibly be a scam, the product works".
They are suffering from the "blind men and an elephant" problem... They cannot understand that what they experienced may be true for them, but is NOT the WHOLE truth.
Here's a very simple analogy... Take a look at this car:
Those of you who know cars should be able to tell, by the GT-R badge on the hood, that this is an older generation, Nissan Skyline R34 GT-R (or a reasonable facsimile thereof), which is a two-door coupe.
Except this is not a coupe. It's a station wagon. A five-door station wagon Nissan GT-R, and no, it's NOT photoshop(ed).
The point is if you ONLY look at the nose of the car, you'd have assumed it's a GT-R. But it's not. You have to see the entire body to realize this is NOT a coupe but a station wagon.
Similarly if you ONLY look at the products of a MLM, you could not have gotten "the whole picture", on whether the company may be a scam or not.
That's why the compensation plan, i.e. what you need to do to get paid by a MLM, is FAR MORE important than the product... It is the PRIMARY indicator on whether the company is a pyramid scheme... or a real MLM.
So how do you determine which is which?