Looking through the forums, there seems to be a lot of fear into what Halo 5: Guardians may become.
As such,
The biggest issue isn’t Warzone itself (Which I’m looking forward to actually) but the lack of a “offline” multiplayer experience. By that I mean, look at Halo Reach’s Firefight mode and MCC’s Spartan Ops. Both were enjoyable game modes, but more importantly I could play both without worrying about whether I’m connected or not.
Now there are other issues people keep bringing up.
Armor customization: Which may I say, the problem mostly stems off the comment that Josh Holmes said before the Halo 5 Beta and probably about the Halo 5 Beta
Playable Elite characters: There really is no excuse for that
Campaign splitscreen: Which is not technically feasible due to limitations (something about 60 fps being spread across four screens not being possible)
The whole lack of variety in playlists (no btb, etc): I’ve heard is due to a “zero-bug” release that 343i is pushing for. Which I’m sure we want all companies to follow anyway, and to which I ask you “Quality or Quantity?”
I think the issue is not what is, but what could be. Everybody on these forums seems to be afraid of what may happen when Halo 5 is released.
(PS: This still doesn’t excuse the elite issue, I’m kinda not happy about that part.)
If 343i could address any of these concerns, it would definitely help to put out the fires.