Beauty is indeed in the eye of the beholder. I am sure there will be some people who do believe brown skin is gross and unappealing. For the most part, most people tend to favor some color to the skin. Medium brown skin is common in some races and I find it extremely attractive. I really don't think that all of the tanning products and services would be profitable if others didn't feel the same and sought to acquire some color in their skin.
Being attracted to someone of medium brown skin is irrelevant. If I am not attracted to her eyes, then her complexion really doesn't matter. If I am attracted to her eyes and she just so happens to have medium brown skin, well there you go...that's your answer, a resounding yes.
In case you haven't noticed, white girls sit in the sun all day trying to get as brown as they possibly can. This is because people with white skin look sickly and corpselike. Stop actin like you're 12 years old! Oops, you ARE 12 years old.