You should read about his tumultuous life, he changed the destiny's of Egypt, Turkey, Afghanistan, Pakistan, and Indian Muslims.although I admit that I know very little about Afghani
I am a follower of Dr. Israr Ahmad, but I do appreciate the mindset of Djamaluddin al Afghani who believed firmly in Pan-Islamic Unity and erasing the divisions among Muslims. Plus, he was instrumental in fighting the colonial powers, esp Britain, in his own way by creating pockets of resistance wherever he went.
Alot known about him is hearsay, and like Abu Muslim al Khorasaani who founded Banu Abbas, he was a secretive character. Even his name is a misnomer, as he was Iranian and not Afghani.