One of the best orators I've ever heard was a CFO / COO of a company I've worked for. I was in awe of how great his delivery was, how he had great comedic timing, and how empathic he seemed to be with his audience.

Turns out, from people who worked with him, he was a complete imbecile, and completely incapable of getting anything done.

I'll take the substance over the sizzle any day of the week.