Mark Audio makes some nice full range speakers. The large metal drivers can suffer from cone brealup, but the paper ones not so much. The Alpair 7 metal-cone driver in a "Pensil" MLTL enclosure can be quite musically satisfying. Don't expect room-filling loud listening levels. But in nearfield applications, say within 6 feet or so of the speakers with the speakers about 5 feet apart works very well. Sharp dynamics, great image and soundstage, [obviously] great timing and coherence.
So, yes. Full range single drive systems can be quite good.
So, yes. Full range single drive systems can be quite good.