Conversely, the vast majority of so-called dedicated center channel speakers are awful, having been designed to accommodate naive expectations and esthetic requirements at the expense of audio performance.
I cannot agree more! 5.1 movie soundtracks are ALL mixed and mastered in the studio with five identical speakers properly mounted at the same position in height. Phantom center more closely approximates what they hear in the studio then a center speaker at knee or chest height - ridiculously misaligned with the R and L channels which tend to be about waist height... a complex lobing pattern will occur due to what is often a one foot height difference between mid range drivers. (One foot is roughly 1000 Hz...so it is right at THE most sensitive range of your hearing...
If you can't mount the center channel properly (same as L and R channel) and your L and R channel speakers image well (as they should if they are audiophile quality) then I believe you are better off without one for a SMALL audience.
If you don't believe me then you should be able to fully enjoy your stereo music (as good as normal) with one speaker turned upside down...try it!!!