I'd say it depends on who you ask and what the condition of the pool is like.
I would imagine that those previewing the property would already have the information that a pool existed on the property before requesting a showing and most signage out front will indicate a pool or spa if buyers are driving by and those who request to see the property are in the market for a pool. Personally when we re located to TX we wanted a pool because our kids were older and could swim. However when our children were smaller, I specifically did not want a pool because of the security issues involved. So I think it can go both ways.
"There's never a second chance to make a first impression!"