Hey
I have never really seen anyone use shotgun. Sometimes some weirdos like me use it, but quickly turn back in disgust. I don't care how much damage it can theoretically deal - machinegun is strictly better at long ranges, and painsaw/flamer much better at short; painsaw is cheaper and uses no ammo. To make things worse, you can only carry 3(!!!) clips with you.
Compare it with lasgun - fast rate of fire, very big clip, no reloading. And the additional advantage of energy weapons is you can use nearby repeaters to recharge.
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My suggestion: either allow for more clips and somewhat faster rate of fire, or
make shotgun a free choice when spawning. Additional variety wouldn't harm the game, and you'd be probably suprised to see most people wouldn't take shotgun for free anyway, because it has short range, and slow rate of fire/little ammo require very good aiming. People don't like to aim well, that's why rocketlaunchers (or Lucifer gun) are so popular in other deathmatch games.
Lasgun has so much ammo even without battery pack it's a very good bang-per-buck weapon, and good joice for jetpacker. And because of its rate of fire, it's much better against dretches at short range; you can keep firing for like 2 minutes without pause.There's simply nothing a shotgun can accomplish better than any other weapon, even considering its cheap price.