I'm a fan of any sniper rifle, the landshark gun from Armed & Dangerous, the fuel air bomb from Mercenaries [http://www.youtube.com/watch?v=jb1e0pD8CkE], and the goop gun from UT but...
My favorite weapon to use, hands down, is the sticky grenade in Halo 2.
My favorite weapon to use, hands down, is the sticky grenade in Halo 2.