Dead island was made Specially for melee weapons guns are just an extra. There are not many guns in the game and bullets are very scares. I understand that its normal for an american to have a gun under there pillow but most country's that's just crazy. So when a zombie apocolypse breaks out on a island i don't expect the whole island to be a gun paradise. Its not normal that everyone has a gun and the developers of dead island therefore focus on melee weapons and stated that guns are just an extra. Only when you arrive at the jungle guns get important but then again your are fighting mostly humans.
I understand there should be guns in this game so everyone is happy but melee has always been the main weapon and i hope it will stay like that.