Joseph is just like that. He is more dog than cat. As a matter of fact, the vet said he looks just like he is descended from a Pixie Bob (bobcat mix!) and he behaves like a feral bobcat as well! Ahhhh ... beautiful cat. Lousy personality. LOL But I love him to bits. He can't groom himself so he ends up with all kinds of mats in his long beautiful fur so I get out the little tiny cuticle scissor and carefully carefully slowly slowly cut out the mats ... while he bites me. LOL
He probably does groom himself, but cats aren't able to untangle their own mats... they need regular grooming from humans for that. I think it also depends upon the texture of their fur.
My youngest cat is also the longest-haired. She started matting up as soon as she started shedding. Big hunking mats, big lumps. So I had to have her shaved (not quite down to the skin, but enough to get rid of the lumps). Now I have to get her used to getting combed and brushed on a regular basis, so that this won't happen again.