Julius Caesar - A hero, or a threat to Rome?

I reckon the best line from William Shakespeare's Julius Caesar is:-

I charm you, by my once commended beauty,
by all your vows of love, and that great vow,
which did incorporate and make us one,
that you unfold to me, your self, your half...

This was said by Portia to Brutus.. in her attempt to persuade Brutus from doing the inevitable.. a story about Caesar who was killed by his own friends and fellow politicians.. how sad.