#2- His poor mic skills
While Roman Reigns is not necessarily a very talented in-ring performer, he is equally terrible when it comes to cutting promos. Don't get me wrong, I'm not saying all his promos are bad. There are some really really good ones like the one he cut on the Monday Night Raw after WWE Wrestlemania 33.
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But, those good promos have been when he's shooting from the hip and being allowed the freedom to take some risks. Most of the time, though, this just isn't the case.
He's usually cutting some bland promo from a pre-determined script which just doesn't help his cause. Just look at the infamous "Sufferin Succotash" promo above.
Being shoehorned into the role of hero despite his divisive status in the company means that he will never connect with the fans and become the face of the company that Vince McMahon so desperately wants him to be. And, this brings us very nicely to our final point...