Poor soul, he has always seemed to me an extremely weak creature, and lamentable much more than admirable. Weak in genius, weak in character (for these two always go together); a poor thin, spasmodic, hectic, shrill and pallid being; -- one of those unfortunates, of whom I often speak, to whom the 'talent of silence', first of all, has been denied. The speech of such is never good for much. Poor Shelley, there is something void and Hades-like in the whole inner-world of him; his universe is all vacant azure, hung with a few frosty mournful if beautiful stars; the very voice of him (his style &c), shrill, shrieky, to my ear has too much of the ghost!
Percy Bysshe Shelley