What constitutes good EC's vs. "stellar" EC's?

Btw, I know “played at Carnegie Hall” has entered the lingo and is used to represent some pinnacle. But it’s a LOT easier to get to CH than folks assume. https://www.npr.org/sections/deceptivecadence/2012/07/31/157671080/how-do-you-get-to-carnegie-hall-no-seriously.