After a few days playing, i generally like the game. I have a few thoughts though.
I miss regular FFA and SWAT, but these complaints aren’t valid as playlist updates will be along shortly. So that’s solved.
Menu’s. I will get used to them, but even when i’m used to them, they are just not as clean and easy to navigate as Reach’s, getting to file share stuff in particular seems harder, going into individual things, then local or file share, instead of just picking file share, and all content been right there. This isn’t a bid issue, just a preference.
Emblems, is there a list of all of these somewhere. Is the double crescent in the game? How do i NOT have a foreground emblem and instead only a background one?
Forge, certain infinity messed up here imo, no precision placement and maps full of un-deletable clutter/giant bases, no water area you can forge in. Potentially fixed with patches/DLC i guess.
No campaign Theater/scoring. Hopefully both these features will be back, we already lost scoring when we lost firefight 
Other than those few things, i’m enjoying it, just seems odd that in 4 years developing it they missed a few things that i think of as standard in Halo games.