If Amla's game is an "Assault", then it might well be the only kind of assault that is pleasing to the eye, even to the fielding side.
Slogging: The current English T20 top order (Wright, Hales, Bairstow, Kiesweter etc)
Calculated assault: Kevin Pietersen, Dhoni, Sangakkara, Clarke etc.
Also Tendulkar in his good ol' days was the perfect example of calculated assault.