What a great thread!
I'm only in my second year of soap making so take everything with a grain of salt, but I have an opinion that not any of you seem to share. That is that I do not like olive oil in my soap. Any soap that I have OO in gets super mushy since my bars experience high traffic and my climate is super humid. Even bars that I buy from professional soapmakers that have OO in them, go mushy on me, no matter how well I treat them. From hearing everyone rave about it in soap, I figured I'd love it, but nope. It's just not for me. Just goes to show you that for certain ingredients, people can have wildly different results based on conditions and personal preference.