Problem 1: Prometheans are pretty much rubbed in to your face in Halo 5, without any introduction or reasons for them to be present (at times). Soldiers in particular are seriously dumbed down versions of Knights, aren’t scary or challenging to fight, and just look to human-like and uninteresting.
Solution 1: Similar question is “why is the Covenent still at war with humanity” in Halo 4 (which has been answered thanks to Spartan Ops), Halo 6 needs to introduce the coolest Pronetheans possible. Rather than just have them all show up all over the galaxy without explanation, they need to be fearsomly introduced slowly throughout the first few missions of Halo 6, with backstory. Similar to Halo 4 even. Get rid of the so-called “soldiers” and replace them with the recently revealed concept art Prometheans.
Problem 2: Cortana turns evil, no logical reasons behind her motivations. This is especially quack because she A: died in Halo 4 and B: did everything in her power to help Cheif stop Halo multiple times and served in the war against the covenant (in other words she helped to protect humanity)
Solution 2: Cortana is not behind the Guardians awakening. She is being influenced or controlled by a much more powerful figure. Possibly the Didact would be the best solution. It would be the best ease of heart to al fans, then Cortans should finally be “rescued” or killed (the choice should be left up to the player, but she disappears anyway). If not the Adudacg controls her (which is the best thing 343 can do for Cortana and for fans to earn her respect again).
More issues and solutions coming to this thread soon. Stay tuned in for more…