Some people have claimed that you never want a y-wing without Ion-turrets. I thought that was true until I fought my brother-in-law tonight. Dutch's ability to give Target Locks to his buddies makes him an awesome support ship.
He kept feeding Target Locks to Luke (who had R2D2) and like an idiot I kept trying to kill Luke. Now admittedly Luke rolled really well and usually kept his damage down to a single hit per round which he immediately healed with a green move and R2D2.
But I have to say having a target lock and a Focus is really really good. Dutch Vander pretty much gave that to a x-wing every turn.
Other thoughts:
I agree, for a competitive game you will want four Rebel ships or you will be swamped by Imperials. 5 TIEs is the minimum that you should expect to face.
Wedge is a murderer. The reason why he will die fast is because if your opponent has fought him before he knows just how deadly he is.
I am not really a big fan of the Luke R2D2 combo. Yes he is really hard to kill, but a good opponent will ignore him and kill every one else first. Luke isn't that hard to kill if he is outnumbered 3 to 1 by TIEs without any support. I would like to point out that I lost my battle tonight, mostly because I forgot that a smart opponent will ignore Luke.
Not to many people have mentioned Biggs. And I have seen him used to protect Luke, but since smart TIEs want to ignore Luke and shoot down his wingman Biggs ability to draw fire isn't an advantage. However Bigs with Wedge is a whole other matter. Everyone wants to kill Wedge before he kills them, but if they have to shoot at Biggs then Wedge gets to kill that many more TIEs before you can focus fire on him.
My favorite list of named Rebels is
Wedge
Biggs
Dutch
Hoiw