Gee, where to start...
The midrange is where we live-PWK
You can't make what you can't measure, because you don't when you've got it made-another gem from PWK, but he was quoting someone else.
The goodness of an audio system (to its owner) is always porportional to the cost and work put into it, and disputing that axiom causes anything from mild controversy to loss of friendship
The very best loudspeakers (and associated signal chain) will give you the occassional impression that the music is indeed right in the room with you. In the realm of the very best, the frequency of this impression sorts the pretty good from the truly impressive. If you think you get this all the time, with all types of music, you are either delusional, your hearing is shot, or you've discovered something the rest of us would really like to know.
Recalibrate your hearing by listening to live, unamplified music as often as possible.
All other factors being equal (which they seldom are), a speaker system with the largest possible midrange radiating area (horn mouth or diaphram size) will generally sound better than a system with a smaller mid area. This relates to the first quote above.
If a manufacturer avers that subjective results are more important by far than instrumented testing, run, don't walk, away from them.
I prefer science-based faith to faith-based science.