Chapter one
Elites
Ok, I believe we all agree that Elites, in the most recent Halo games, have been nothing but hunchback dinosuars with annoying voices, and if you don't know what I'm talking about then play Halo 3 campaign and shoot one just once (they all almost have the same idiotic voices).
What I think needs to happen is make the Elites stand up straight. It's fine if they're bigger than Spartans, just make them bigger in campaign but make them smaller (not hunchbacked) in multiplayer.
Also, give the Elites a voice that sounds somewhat like the voice of the Arbiter, or the Shipmaster (forget his name =P) that we saw through out Halo 2 and 3.
Chapter two
Brutes
I know we most likely won't see them in Reach, but if we do I have some requests of what would make them more scary and not just guerillas with a gun.
Keep the armor, but don't give it bright and shiney colors. Maybe grey or tan or anything that doesn't remind me of a teletubby holding a Spiker. Their armor should have some scratches and dents in it, too.
Also, they should be roaring and growling and not screaming things like "HE WAS MY LOVER!".
Make them like freakin' scary alien barbarians that kill anything without a hint of mercy, which is something that they did in the Halo 3 Landfall trailer and the Halo 3: ODST live action trailer.
Em' Brutes are scary mofos aint dey?
Chapter three
Grunts
There isn't much I'd have to complain about the Grunts except for they should have a bit more sinister voice, and not so high piched.
Also, drop the funny comments. They may be enjoyable, but only have them there when the IWHBYD skull is activated. All other times they should be be a LITTLE bit more frightening.
Chapter four
Marines
The most stupid things on the battlefield, even more stupid than Grunts, would have to be the current UNSC Marine.
They lack skill in all aspects.
How about we talk about their use of brain function! Oh yeah, there isn't any!!!
What I don't know is what kind of A.I. a Marine has inside his head in the Halo universe. They need to not just jump into a fight while firing off a few Assault Rifle round then go up to a Brute and get themselves killed! Have some common sense!
Bungie, make them like a real Marine would act! I shouldn't have to explain it.
Chapter five
The Croud Pleaser... the Spartans!
Master Chief, in the Halo games, has only been known to run and gun, while in the book the Spartans are like super human ninjas.
Why not have a control to let them maybe jump and do a flip in the air. That could put some more B.A. on Halo.
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That's all I got. Sorry this was a kinda long thread, but I thought my ideas might as well be heard.
If you have anything else to add please discuss it.