As @turbo07 has stated earlier, "I'll tell you once again, benefit of using any kind of hidden mechanics never justifies the risk. So we simply don't use them. "
Furthermore, below is the wiki detailing how our MM actually functions. I have had whole weekends where my W/R has been like 40% and then the next day it is 85%.... it is just how online gaming functions. Sometimes you get potato'd and sometimes you fry the potatoes.....
There isn't some great conspiracy involved folks...