[Razor2]

You don't even need your main char to be skilled with missile weapons. In BG1 take Coran equip him with some nice magic longbow and some bracer with bonus for missile weapons (bracers of archery, if I remember right) and you've got a sniper killing machine. Give Imoen some magic short bow and use her as mage/thief archer and get another power mage like Xan to complement it and the game can be won like a cakewalk.

In BG2 its a tad different, because I haven't found so many good suitable chars for the job, maybe Yoshimo in the first part and Vaygar later, but the later has some really nice sword, which only he can use, it would be a pity not to use it. But with 2 Mages (Imoen and Aerie) you can still cause havoc on great distance with some nice destructive spells. Also there is a problem in the game with the huge ACs and low THAC0s of some enemies, you won't hit some of them with missiles, because I don't think there are better than +3 arrows in the game, and even they are incredibly rare. Swords come on the other hand as good as +5 and are much more common, that you find some really cool melee weapons.