The indefinable difference which makes imaginative work into poetry is not there.

There is abundance of invention; but that, though a part of imagination, belongs as much to the art of prose as to the art of poetry.
Browning could write thus, out of his intellect alone.

None of the greater poets could.

Their genius could not work without fusing into their intellectual work intensity of feeling; and that combination secured poetic treatment of their subject.

It would have been totally impossible for Milton, Shakespeare, Dante, Vergil, or even the great mass of second-rate poets, to have written some of Browning's so-called poetry--no matter how they tried.