I think it depends on whether the first date is in real life, or through a dating site.
I don´t expect too many shocks on a RL date, they may come later though. However, dating site dates, in my experience, tend to be a real eye opener immediately, due to only having seen a photo, and IT or telephone communication.
So, if we are talking about a CS date, I don´t want to meet somebody who looks nothing like their photo, or who has obviously been lying in their profile. (no offence to honest CS dates I´ve had where there was simply no chemistry)
Has happened to me 6 times now so perhaps I´m a bit jaded.