The rock mic's skills have always been over-exaggerated. He is pretty mediocre to be honest. They used to make fun of him all the time during the attitude era, I remember promos where Undertaker/ Big show and many others would throw in insider comments like "rock all you speak is nursery rhymes" etc. He used swearing in his catchphrases to get himself over, anyone can do that, it's not hard to do. These days it's more difficult to cut a good promo because you can't swear to get a cheap pop.