Unrippled verse, which many readers demand, MUST be more or less mechanical. Such verse flows according to its own sweet will, independently of the thought-articulation. But the thought-articulation may be so flimsy that it's well enough for the verse so to flow. Verse-music is never with him a mere literary indulgence. The grotesquerie of rhythm and rhyme which some of his poems exhibit, is as organic as any other feature of his language-shaping, and shows the rarest command of language.
Formal classification is easy, but of little use.
When we have distinguished compositions as dramatic, lyrical, or characterized a poet in like manner, we have done little. What we want to ascertain is the peculiar quality of the imaginative stuff with which he plastically works, and to appreciate its worth. This is always a great task, but one particularly necessary in the case of Browning, because the stuff in which he has wrought is so novel in the poet's hands. The function of artists, that is, musicians, poets in the narrower sense, and painters, is to clothe Truth in sights and sounds for the hearing and seeing of us all. Their call to do this lies in their finer and fuller aesthetic faculty.