To start, he has a very thorough understanding of how the pro-wrestling business operates. He's been a writer and worked behind the scenes. He has valid credentials that set him apart from most other pro-wrestlers.
From a very early age, he was inspired to be a wrestler. He went through a identity crisis until he drew from traumatic childhood experiences. He took the emotional scars and created a dark and psychologically twisted persona rather than see a psychiatrist. Rather than create a completely fabricated personality, he made one forged from his psyche. One that he could easily blend naturally well into.
From the time Raven makes his entrance to the time the match ends, he proves himself to be TNA's most ruthless. He's vicious, sadistic, ambitious, cruel, violent, and merciless. He's the ideal image of what more heels or villains ought to aspire. He's arrogant and cares about no one but himself. He has no concept of sportsmanship, morality, honor, or respect. His goal is to severely torture his opponents by the most brutal methods (chairs, ladders, chains, staple guns, shopping carts, you name it.) His signature move: DDT Raven Effect as he explained was meant to drive the opponent's head into the ground. He knows how to pace matches, performing outrageous stunts and creative counters. His attacks aren't just physical, they're also psychological. He loves to make wrestlers think they have the upper hand, only to make a counter. He loves pain in the fullest and will often sacrifice his own body if it means winning the match. He has no remorse or compassion for what he does to his opponents and that's what makes him a monster. It's no surprise that he invented his own "Clockwork Orange: House of Fun" match type. When i realized this, i could clearly see why he was the ideal candidate to compete at TNA's Monster's ball against Abyss, Rhino, Black Reign, and Monty Brown.
In summary, Raven is one of the greatest wrestling legends in history. Creative story archs, intense feuds, and the most brutal wrestling stunts make him into an entertainer dabbling with brutality. His ingenious talent should have been widely recognized in the WWE/WWF had he gained the spot for it. Raven though retiring to start his own wrestling school, still impacts wrestling to this day.