[geoelectric]

Depends. Sometimes people write slideshows for internet sharing, in which case they're crappy presentations but text-heavy enough to be effective. Netflix's classic "Culture Deck" is a decent example there.

But the ones that are good for presentations--that is to say, visual interest hooks, not the info being repeated--yeah, not great unless they include an audio track or something.

Edit: this one's somewhere in the middle.