Don't discriminate; use all the weapons
There is a large arsenal of weapons, and unlike other games, every gun and every firing mode has a use in some way, shape, or form. For example, the double-barreled shotgun packs a massive punch to up-close enemies, but it reloads slowly. At the same time, other smaller faster-shooting weapons like rifles may do better with constant damage with the tradeoff of minor attack power.