Mark Logic CEO Dave Kellogg (back in 2005) – Uh, Oh - It's Magic:

"I’ll tell you one thing that I think is wrong with search: magic. If there’s one lesson I learned in 20+ years in the data world, it’s that magic doesn’t sell. Customers don’t like magic.

[…] I chuckle when I see search vendors chest-thumping about Bayesian this-or-that in their marketing. I majored in math at Berkeley and barely understand Bayesian inferencing. Will your average customer do any better? When vendors think they’re impressing customers with their algorithms, they’re just scaring them."