His poems are stiff. Imagination without life breathed into it is worthless in poetry.
If I time traveled to his time and sneaked my great poem "Song for the Volcanoes" into his collection, people might recognize it as the most genuine piece in the whole collection..
Works by 李賀 breathe, are made of living cells. "Strange" but organic. He is the real great poet.
If Li He once liked Han Yu, I think it was mostly because he was in need of some new kind of inspirations.