I played messed up Halo 5 only for a while. I turned back to MCC which is faaar more funny and better.
I will not buy Halo 6, if:
there will be no Split-screen again as default function
game will hardly push me to spend real money for things that should be as defaults
it will be so hard to reach armor permutations
there will be REQ system
Warzone will not have power weapons and vehicles as default
there will not be Theater
campaign will not be focused on Master Chief and if it will not be much more longer
there will be lack of Social playlists (Action sack, Griffball, Infection, etc.)
game will not turn back to its roots in gameplay
Shortly - if 343+MS will do it their own, capitalist, way without pinch of healthy sense.