Sorry, I strongly disagree.
There is plenty of evidence that would suggest that the MM's are real and influence the day to day price action.
There are more than one & can include large retailers, broking houses, professional investors etc.
When the term MM is used it is not referring to one entity, nor is it necessarily referring to a particular type of trader or professional broking house.
The term MM is also just another terminology for the "Smart Money" (SM), The Composite Operator" (CO) etc etc.
There are some very informative articles on the web that can improve ones understanding of these things.
http://www.rookietrader.com/basics-of-trading/smart-money-defined/
Smart Money Defined
Richard D. Wyckoff carefully studied the Smart Money traders of his time and discovered that all markets are moved by the big players he called the Composite Operator (CO). Of course there are many deep pocket traders who make up the CO, but it is much easier to consider them all as a single entity. Among these traders are Market Makers, Specialists, Institutions, Large Traders (see The COT Report) who provide liquidity for Commercials hedging a market, and, with the ever advancing computer systems, Dark Pools, and the mathematical whizzes known as Quants.
