Definitely don't take anything personally about how many downloads your submissions get! For example, when it comes to builds, I pretty much only download average-sized midcentury houses. Almost all of those gorgeous palaces and tiny homes simply get passed by, not because they aren't awesome, but because it's just not my thing.
When it comes to CAS creations, I only download unusual ones. I have more than enough conventionally attractive Sims already. And I prefer celebrities, because it's so funny seeing them do ridiculous things in my game. So again, gorgeous creations are being passed by through no fault of their own.
I'm sure other people have their own weird reasons for what they download. Just know that you're awesome for sharing anything with the community at all, and even if one person downloads your creation, that's one person you've helped! :)
On a personal note, I find it odd that people have downloaded Spock's quarters from my gallery, but not a single person has downloaded Uhura's.