#7 CM Punk
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The UFC signing of CM Punk could be one of the most (if not the most) unique and controversial ones in UFC history. Here was a former WWE superstar who had zero experience in mixed martial arts fighting in the world's most premier MMA organization for his debut. No amateur fights, no fights in smaller shows.
When it was first announced in 2014, many fighters on the roster such as Nate Diaz did not like the idea at all. To add insult to injury for those who are against it, Punk is now being slated for his second UFC fight that will be broadcasted on pay-per-view, even after an abysmal debut against Mickey Gall in 2016.
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Punk may get all the hate for now, but another angle that seems to pique the interest of fans is the possibility of him fighting Floyd Mayweather Jr., who has teased about a move to MMA. if Punk can beat Mayweather, he may just earn himself some love, and lots of it.