No, he isn't up to the job of being leader simply because he doesn't come across as a man in charge, he comes across as a back-room boy who has suddenly been put in the spotlight. He doesn't his points across clearly. Clarity of expression is vital in the job, because it suggests clarity of thought and purpose.
'Charisma' is not vital, nor is good looks, but looking and being confident, clear and decisive is. I'm sure he's very good in committees, but a good committee man (or anyone who thinks they achieve anything efficiently!) is not the ideal leader. Even Clem Attlee, who looked a modest, uncharismatic, man, was decisive in manoeuvering, to his own way, the otherwise warring, powerful, factions in his own party, and with great skill; the Emperor Claudius of British politics!