Usually high dex allows folks on the side line to hit with ranged attacks while the tanks tear into the ranks. Nothing wrong with a few buffs if possible. Potions, nets (didn't think of that one before), splash weapons and at the very least a good ole crossbow as 'simple weapon' will be a big help. If possible, at least add one level of a martial class into a character build to use all the weapons possible, esp. characters that can't really use armor effectively. That will help get rid of opponents a bit faster. Summoners can shot a crossbow at the very least. Also pay attention to terrain and positions. I've no problem hiding behind tanks and smacking targets with reach weapons. Longspears are simple weapons and a wizard can be behind a fighter and stick folk with a long spear from behind a tank so having a semi-decent strength score isn't too bad of an idea if you chose this route.