I wonder if Reach having so many unique environments ties back to their reuse of geometry for multiplayer. I'd say it has to, but maybe it's also combined with their desire to make their 'swan song' as best as possible.

I'd find it interesting to see how many environments video games produce on average historically. From Super Mario Brothers to Titanfall 2, I would find it fascinating to know an average and see where Halo fits on that trend.

Side note, but the Genesis environment in Halo 5 was honestly the first time since Halo 1 that I've felt that whole 'alien world' feel. Neither Requiem or the Ark ever really pulled that off for me, but it was something that I loved about Halo 5 and was glad to experience in a Halo game again.

- MacGyver10