Not good at Wrestling: Hulk Hogan
Hulk Hogan's name is synonymous with pro wrestling itself for an entire generation of fans. He can legitimately claim to have revolutionized the industry not only once, but twice. The first was the Rock N Wrestling connection, which made pro wrestling a cable television staple, and the second was the advent of the NWO which was the impetus for the Monday Night War.
That all being said, Hogan's in-ring skills were limited at best. Born with scoliosis, Hogan always was plagued by back problems even in his youth. His physical maladies made it difficult for him to move as he aged. Also, Hogan quite frankly figured he didn't need to be a stellar technical wrestler. He was huge, and had a great look, and his microphone skills were the best in the business.
Of course, this doesn't mean as much to his peers. Vergne Gange was once asked what he thought of Hogan, and responded "As a man who has done well for himself I give him a nine or a ten. As a wrestler, I give him a one or maybe even a zero. My Grandmother can do a better legdrop!"
Here's Hogan vs. the Shark in an encounter no one remembers for good reasons.