While it was a number of years ago, Golf Digest asked a number of tour players to rank the majors in order of their personal preference. As you might expect, most US players picked the US Open and Masters above the British Open. Non US players usually picked the British Open first, with the Masters being generally second. Hence, for the most part it depends on where you're from and the style of game required by the type of course you typically play/watch.
I don't agree that the BO courses are photogenic. Compared to Augusta, Cypress Point or Pebble they don't really knock your eyes out visually. In fact, they come across as pretty bland on television. The reason is they are flatter and have far fewer trees than the typical course we see here. But, they have their own type of character. The subtle humps and bumps that don't come across very well on TV. That is why I think it's more important for the BO to be in HD than any of the others. Its because their hidden and unique charm is nearly invisible in SD and US viewers are denied the opportunity to see what the players see. In my opinion, even more than the other majors.