Depends on the map really. I don't bring them if the map is too close packed and open. Though I do complain that they are nerfed hard now, I still remember how Gordin can one hit kill (or at least double and kill) most dracoknights back then with unforged iron bow, now they have trouble with pegasus knights even.
Especially Rebecca, probably one of the best I've used.
In this game I'm a little torn though, as Assassins can use bows and Warriors are a bit more capable (and Berserker's have been nerfed :| ). My Virion isn't turnout out well so I'll see if Noire or someone else turns out a little better.
What would be sweet is if they gave Snipers a critical bonus a long with returning it to SM's and Berserkers. I mean, Sure shot? The hell is that crap?
Virion was in my party for most of the early game. In the middle, I pretty much sidelined him. Now towards the endgame, and I've been bringing Noire on pretty much every mission with me, though she's a Bow Knight. I still use Virion on occasion.
Ah, yes, the Negotiator: General Kenobi <sneaky beeping>