What are some of the most underrated and overrated loudspeakers you’ve auditioned?

I always thought that the 15 ohm LS3/5A was way overrated. Same for the original Quad ESL. I know, that goes against HiFi canon but I've had both for extended periods, years actually, and they just didn't do it.

Underrated, well the Acoustat 2+2 was marvelous. Too big and heavy to keep but easy to drive and great to listen to. They seem to make nobody's list.