I don't like tacky looking toys and would be more reluctant to buy them. But honestly if a really ugly toy has consistently awesome reviews (like the Eroscillator), it wouldn't be a problem. I think cuteness is a bonus but ultimately it's about function for me.
It's not the only deciding factor, but appearance does matter (and on one occasion has caused me to give up a toy). In most cases, looks will draw me to a toy, then the reviews will either seal or break the deal.