Michael was a machine at handling his work as the Don. He didn't allow himself to be consumed by emotion (until GFIII), but even then, the power, once again, had shifted. If he were running for office, he would gain the reception as Hillary Clinton (when several consider her to be very cold). In the mafia, however, charisma isn't as essential as it is in the political field.

The Corleone Family under Michael's control can be best summed up by this quote from Alexander Solzhenitsyn:

"The aims of a great empire and the moral health of a people are incompatible."