It's nice to see some reason on the internet these days (even if it is rare... ). I like the points you're putting out there, and that you're not destroying 343i for their decisions. I was gonna make my own thread, but seeing as we share the mood of "good job with Halo 4! but, here's some advice..." I'll just join you here.
Personally, I am loving this game to death. I have not enjoyed the multiplayer in a game this much in a very long time, I almost want to say since the good ol' times of Halo 2. So hats off to 343i for their excellent first shot at the Halo franchise!
That being said though, the points you bring up are pretty justified, I think that only one primary rifle should be present in SWAT. It only seems balanced that way. Also, I seem to remember a time with Damage Resistance on in SWAT... it should take more than one melee to kill someone, and more than 3-4 shots that aren't headshots to kill as well.
You're point with the DMR is my only disagreement. It doesn't bother me all that much... we are cyborg super soldiers after all... shooting is shooting, and recoil-less guns in Halo I don't mind... just my opinion of course.
With CLASSIC Double Team... 1) any Double Team would be nice... and if not Classic Doubles, why not just Classic Slayer, er, anything really. The good ol' 4v4, no ordnance, no loadouts (DMR/BR on the map and such) but still radar and all that jazz (so not Slayer Pro lol).
Only things I would add:
1) Bugs need to be looked at... quickly. Oddball on Complex, for example, is now a bother...
2) FLOOD LOADOUTS. We NEEEEED to be able to customize them again! I feel most of the custom game options in general are very much lacking from previous Halo titles... and that makes me quite sad... :'(
Also... I too really loved the campaign! As I said, hats off to 343i for an overall great job!