One of the reasons Amway Global is considered legal is because agents are not paid directly for recruiting others. Some other MLM opportunities were shut down in the past for this very reason. That being said, just because an opportunity is legal doesn't mean that it is profitable for those involved and it doesn't mean that it is a long term sustainable source of income and many would lead you to believe.
What's interesting is that despite the fact that Amway doesn't pay you for recruiting, it is the emphasis of many IBOs, and the emphasis of much of the teaching in some AMOs. This is because coveted levels such as "emereald" or "diamond" cannot be achieved without recruiting downline. These coveted levels are often promoted with displays of lavish lifestyles, thus the desire of many IBOs is to recruit everyone they know in the hopes of achieving these lifestyles. Sadly, very very few will ever attain those lifestyles, and some of the people who do attain them are not able to sustain them.
Unfortunately, much of Amway's spotty reputation is directly due to some questionable recruitment tactics. People are often tricked into attending meetings, or lured into a meeting without being told what the oportunity actually is. In my first brush with Amway, I was invited to a beer bust as a college student and when I arrived, I was greeted by my friend wearing a suit and the white board set up in the living room. Needless to say, I was not impressed and formed a poor opinion about Amway.
So IBOs and information seekers, if you are recruiting others, I would be of the opinion that honesty and openness about the opportunity is the best way to operate. You will still have people turn you down, but at least they won't form negative opinions about Amway and the way you operate.