watch this:
http://www.youtube.com/watch?v=_ant4Wfc4b0
the cool thing is that units can wield 3 different (or more?) weapons now
so a rifle for long range, machine gun for burst, flamethrowr for close range
and now imagine
8 players, everyone chooses a different character
they barricade themselves somewhere
you hear one marine scream
"Zerg incoming, defend yourselves!!!"
everyone starts shooting and tries to stop the swarm as they manage to cross the barricade
"Fall back!" while retreating, the technican class runs up to the consoles and activates a few towers to cover their retreat and the heavy gunner jumps into the Goliath mechs and wreaks havoc over the zerglings
oh pls, someone create such a map ^^
http://www.youtube.com/watch?v=E4w1Xfdk5ZA basically just like this, only better and bigger
or maybe rebuild omaha beach and add a few comp-marines who also help defend against invading forces.