imho the first community pack added a great variety for each perks involved.
buzzsaw bow made the zerk, with the right extent, a ranged perk
the scythe is fun to use, especially with the grim reaper skin

the tommy gun is fun to use, but only for the first waves. It offers some choice to commando.
Flare revolver are just great not only for fb but even for every other perk. good power, good rate of fire, just pretty slow recharge.
the steampunk weapon pack is pretty lame.
Orca? Meh, the physics in KF doesn't allow to make some good over-the-corner kills. Maybe i'm just not used to it.
Musket? people keeps saying it's better than lar. to me, lar remain the best. the scope is pretty hard to master, and so the weapon itself it's hard to master. Lar is more immediate.
tommygun sp? we didn't really need that.
zed thrower? At first look, it can seems a ranged counterpart of dwarfish axe, but instead it's not very useful. the push back feature is not as fast as axe and its power is laughable. It seems like a sp counterpart of nailgun if we see its power.
2cents