Look even saying "Halo was never good" on /v/ is a cliché.
The situation with Halo is very simple, 343i is a failure at a fundamental level.
In 17 years they haven't assembled a dedicated dev team for their projects.
It has always been a pastiche of interns and temporal hires that somehow managed to stich up a game in like 6 years.
Halo Studios, which are the same fuckfaces are in the same situation.
You cannot expect an organization to meet their goals when you spend most of your time sorting through personnel.
To give you a general idea users from /v/, reddit, gamebanana, and like dozens of other sites wrote Halo 5 one line at the time before they were chewed out. Basically "Twitch codes Halo 5"
The reason why Halo Studios was more optimistic with the prospect of Halo CE:R is because they thought that Blam! / Slipspace was the problem and not their ridiculous hiring policies.
So a thousand monkeys with Unreal Engine 5 should probably lead you to something at least presentable, but it is obvious that Halo CE:R is going to fail.
If MS is so adamant in their position to have ZERO full time employees, then the other solution would be to give the IP to Treyarch or Id Software.
Shrimple as that.