Aye, sword wielding magus with power attack makes wonderful 'single hit nova' build. More so if go vital strike route. Besides you should not forget magus is a spellcaster and spellcasters can do lot more than just dmg with spells (utility with dimension door, divinations, etc). I myself like make my chars versatile as possible and do low to mediocore dmg (unless high dmg is default state of the class).