Huge Lennon fan, I think he was the definitive rock star. Everything about him was so iconic, the voice, the wit, the granny glasses, he's been much replicated by countless rock stars since his death but never bettered, he was a true orignial.
Eccentric and off the wall but always entertaining, he led such a wild life: naked album covers, peace protests, bed in's, followed by the FBI, affair with May Pang, the whole Lost Weekend era and finally re-united with Yoko, its amazing how much he packed into such a relatively short life.
Oh and Plastic Ono Band and the Imagine albums prove he was still capable of genuinely great things outside of The Beatles.