Yeah, only some guns do headshot damage. BR does, I don't think the assault rifle does.
Knowing the maps helps a LOT. Knowing what to do at the beginning of a game helps a LOT too.
Example - At the beginning of a game on The Pit, I go straight for the BR and two sticky grenades, then I go for the hallway with the active camo. As soon as I turn the corner I toss a grenade so it lands just past the other end of the hallway. It blows up the exploding barrels and kills the guy who was trying to do the same thing I was doing. Those exploding barrels are very useful, especially when you have a sniper rifle. If you see a guy running past one, don't bother trying to shoot him - shoot the barrel and watch him fly. That is, if you have a sniper rifle or you can hit it with a grenade. Don't try to blow them up with the assault rifle.
😉 On Snowbound if you want the ghost, the fastest way is to go up and over the base, NOT around it. Same with Isolation - shortest distance is a straight line. Of course you better hope one of your teammates goes for the rocket launcher. With a mongoose you can get to the rocket launcher at the exact same time you'd get to the ghost, and rockets beat ghosts. On High Ground, if you start inside the base you get first dibs on the rocket launcher. Hop on a mongoose and and there's nothing the other team can do to stop you. Of course you better hope your team backs you up, or you're going to lose that rocket launcher. On Construct, if you start on the side with the gold elevator, you can jump and toss a grenade just to the left of the right side purple elevator - big explosion, and anyone who tried to go over the top on that side is dead.
Like I said, knowing the maps helps a LOT. Not only so you can do the stuff I listed (which mostly works against bad players), but so you can AVOID having it happen to you.
The sword is a fun and frustrating weapon. It works best when your team works with you.
If you don't like sniping, use the shotgun. Of course Team Snipers sticks you with the crappy Magnum, but I actually had a Team Snipers game where I had the most kills with the Magnum. AND we won, AND I went 16-5, AND I was MVP. :Q
http://www.bungie.net/Stats/Ga...56481440&player=mugsNJ Despite the fact that nearly everyone in the game uses ~5 weapons almost exclusively, just about any weapon has strengths and can be effective. Take advantage of the strengths of your weapons, and be aware of their weaknesses. DON'T run out into the middle of a field on Valhalla armed with an assault rifle and a magnum - you'll die. If you have a short range weapon, stick to places where you can't be attacked from a distance. The assault rifle is misnamed. It's really a SMG, and the SMG is more like a machine pistol. You need to be pretty close to use the assault rifle effectively.