Sorry guys but the best CC isn't slow, or knockback, or pull . No, the best crowd control is to make 'em dead. rosted genlock don't jump around poking you.
the whole force tree seem particulary unintersting when you can instead master both the elemental and primal tree. image the insane burst damage you could do:
Imagine that scene you play on nightmare, your tank have the anullement passive from templar and the elemental aegis sustain from the defender tree, gaining near imunity do elemental magic, you lunch that tank in a horde of darkspawn, taunt a good 20 of them in one go and as soon as they get whithing range, before they can hurt your tank, you unleash hell on them!!!
upgrade fireball, upgrade firestorm, upgrade tempest all cast back to back obliterating them.
you could also have your arche throw in a burst shot and an hail of arrow for good measure, your tnak should take it. and you'd still ahve your cone of frost and chain lighthing as back up.
what's a sight of beauty

too bad playing mage mean killing bethany, don't think i'll have the stomach for it.
to come back to force mage if it was specialized in single target spell then yes it would be very usefull as it would mahe mages on par with varric or sebastien, too bad it isn't so.