Ahem.
About that "goblin-men" reference: "goblin" is synonymous with "orc". Thus "goblin-men" is another way of saying "orc-men", meaning "creatures with traits of both orcs and men", and as such it is reasonable to conclude that we're talking about half-orcs. Crossbreeding pure orcs with half-orcs to produce Uruk-Hai would get the result we see in the books and the film: a creature with all of the desireable (from Sauron and Saruman's POV) traits of both species. Orcs of man-like stature and intelligence, able to operate without penalty in sunlight, but possessed of orc-like strength, stamina and ferocity- that's your Uruk-Hai.
It makes sense to me.