L4D 1 all the way. In left for dead two I don't have any characters I want to be because they are all lame. But in L4D 1 all the characters are cool and are not western or whatever.
They should have a chainsaw gun. The gun part would be an Assault Rifle and the chainsaw part would be your melee weapon. The chainsaw would be a none stop melee weapon, you wold just hold down mouse 1 and the saw would be cutting constantly dealing a steady stream of damage.