I love the halo 4. Got the limited edition its awesome one of the best games ever. No not complaining so they change them just venting my frustration. What I hate them because there Cowards! You shoot them and then they flee which makes me chase after them because I want to kill them more. So I end this with a question for you. I usually snipe the crap out of them and it feels so good.
Tell me Forum? Whats your way of killing them? 
I prefer to assassinate them. It’s difficult, but very worth it.
Needlers work surprisingly well.
Rail Gun.
Phantom Turret.
Two fingers to the eyes.
Just found out the shotgun works good I haft to give a salute to the guy who said rail gun. Nothing like a good boom stick.
At first I used to snipe them. Now I run up to them and gun them down with the AR/Suppressor. They die faster this way to me and man does it feel good.
Plasma Pistol - I wanna torture those -Yoinks!- until they’re just a pile of melted, broken metal.
Yes they’re cowardly but the real problem is that I can’t tell their weaknesses. Sometimes it takes 3 shots with the DMR, other times it takes 5-9 shots. Also, it seems like they have shields.
Only like 2 guns actually prove to be effective on them:
Suppressor - keeps them on the run
Binary Rifle - 1 hit kill