So far in my games I've played as a rogue. I don't like the warrior class because I'm not one with two handed weapons or a sword and shield. I prefer to have two swords, or in DA's case two daggers. Most of the time my party consist of three melee and one ranged, the one ranged was a mage, either Solas or Dorian. Can't stand that uppity Vivienne. So that rules out Sera and Varric, they're both thieves that use ranged weapons.
So for me this particular play through is very different than my others. Using two melee and two ranged (mage and Sera's bow). And she is good with a bow. She survived little damage in my first dragon encounter in this play through and she dished out good damage.
Never used Cole in any of my games. He's just weird and he's a thief with daggers which is what my characters have been. I like Bull, he good but I wish they made him more like Sten. Sten was awesome. When I think of Qunari I think of Sten.