Right, on polo bikes or mountain bikes they're quite suitable.

Moustache bars are damn comfortable, and look nice on certain bikes (usually ones with nice fenders and vintage goodies). I wouldn't really call them road drops with no drops.. they're completely different. Usually they swoop forward for a truncated form of a bullhorn, then sweep back for a wide and upright position. All of this is roughly in a plane parallel to the ground, although the outer parts may be dropped a little.