I mean, I think I liked it best when it was simple, humans vs. the Covenant, with another parasitic alien race getting involved. The Halo's themselves are extremely Sci-Fi, but as they're the central premise, I'm fine with it. I liked it best when they were these "Amazing inventions left behind from an ancient alien race". I enjoyed the small hints of what we got to learn from the Forerunners. However, all the new Halo's are getting way too Sci-Fi for me, in a bad way. I just don't enjoy all these stories involving the Forerunners, more and more about the Forerunners. I liked it better when they were a DEAD alien race, with some of their inventions being discovered to pose a deadly threat. All in all, I think what I'm saying is I dislike all the focus being on the Forerunners. This could be why Reach was my favorite Campaign, because it focused almost entirely on just the humans vs the covenant.