Wow, that's interesting to see that they are avoided by so many. Am I safe to assume though that this is more of a cultural thing?
I am not from the USA, and do not associate polos with preppy (as that concept doesn't exist in that form in my neck of the woods), sporty or work uniforms. But I think we have different concept of pollos. The ones I own are fitted and show off my curves.
That said, I am partial to anything with a collar. It is weird though - I have an average-length neck but it always seems that colars seem to elongate it. Kind of counter-intuititve, no? I also love me a mandarin collar and love my turtlenecks.