I'd have to agree with this, personally
Pretty much any dog breed has a multitude of problems associated with the breed- for many larger breeds hip dysplasia is a big problem, dobermans have a fairly high incidence of von willebrands disease, brachycephalic breeds (squashed face breeds like bulldogs, boxers, pugs) have a wide assortment of congenital problems which they often refer to as brachycephalic airway syndrome- really small nares/nostrils, a long soft palate that restricts their breathing, a narrow trachea and eventually, everted saccules which make breathing difficult. The narrow nares, soft palate and saccules can all be corrected surgically, but of course it costs! Breeds with floppy, very hairy ears are prone to ear infections.
Its all a bit of a gamble, and there is the potential for any breed to have problems! The benefit of a cross-breed dog is that you have a combination of genes, so hopefully the dog is less likely to recieve all the genes that lead to these hereditary problems. There is still no certainty that you'll have a 'problem free' dog though.
If you were going to get a pure bred dog, get one off a breeder that seems to care about their animals, and not just winning shows. And if you get a breed prone to hip dysplasia, elbow dysplasia etc. then make sure that the parents of the pups was tested for these
Sorry, I got a bit carried away