
and i guess i'll get things started:
favorite weapon: spore discharger. just something about this i love. it starts off a little slow, but as you add in to it you get a real powerhouse of an AOE weapon against the machines. i also feel it upgrades well, and with repeated fire (especially from a group) i believe it can be an incredibly devastating weapon if used properly. the unlimited ammo is a nice touch too.
favorite melee weapon: concussion staff. i love the knockdown potential, and it works nicely with WP reverse stroke to quickly neutralise an enemy by denying them any actions faster than they can get them.