I'm the type of player that ambushes, sets traps, or weakens the enemy before engaging. So I always get the first shot off, or if I don't the enemy is already weakened with a grenade or other splash damage.
The sheer stupidity of seeing someone move side to side, duck up and down, and even jump like a little kid is so sad seeing how I'm just standing still popping their heads and they die. I love it, that just deserves a teabagging (although now I just shoot their dead bodies)
There are some people that strafe crazy good, but that's a different story.
Back when I was a kid (before TC was born probably), strafing was the only way to survive in FPS games like Goldeneye 007, Duke Nukem 3D, Quake etc.
Halo CE was my first FPS multiplayer game outside of 1v1 in Medal of Honor. Idk, none of my friends strafed, I didn't strafe. Never seen the need to, 1.85 K/D through Halo 2 to Halo 3 to Halo Reach 'aint too shabby.
I mean, I'm going to shoot you in the head....you move your body right, I'm going to shoot you in the head still.