Three problems with the Halo Series;
1- It's not canon but it tries to be. There's no middle ground that works.
2- The lead should have been a voice only actor. Master chief's mystique comes from being faceless.
3- They put it on the worst-run streaming service.
The CGI and action set pieces were decent but too much soap opera got in the way. A movie might've worked better.
It's too early for a follow up but next time it needs to be canon, animated or star an ego-less actor who doesn't mind not showing his face. and, above all, put it somewhere that reaches the whole planet not just the US and EU.
The reported GEARS project needs to consider this as well as learn from FALLOUT, which got it right on all counts. There is lots of room in the Gears mythology for a Movie or series involving different characters and situations. starting with how did humans arrive on a high-gravity planet and adapt to it and how hostile was it to start with.
Another franchise to look at is OUTER PLANETS, preferably as a comedy series.
There's possibilities but as they say, it takes care to get it right.
(just look at BORDERLANDS.)