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

I think that ATC speakers whether passive or active are simply too honest to be ever considered overrated.

Way under rated 

Wilson Benesch
ProAc's
Chapman Audio 

Over rated.....to many to name...

For the money, a pair of 300 dollar Elac UB5 is hard to beat.  Sure, it's not a high end speaker, but for 300 bucks it is a damn good speaker.   The difference in sound between that and other more expensive speakers can be minimal.  

For me the KEF-LS-50. I tried to like it but eventually ended up selling it. Way overrated in my opinion. I tried it with many different amps and configurations  and in different rooms. Nothing seemed to work for me. 

Still using the Dahlquist DQM-9s. To me the quality and sound for the money I have not found better. Sure overtime they need to be re-foamed and maybe new caps but after all these years, still happy. Also like the older Infinity.