I was just playing Halo 1 PC last night, it's still great.
The big question is, will online coop be a thing now? Will they finally add back in that vital feature which they removed literally to help sell their POC console?
While people can say what they want about the gameplay of the Halo series, good or bad, I went to that game for the story. It does have a pretty big depth of backstory you can find in novels and the games. They seemed to have put a good bit of effort into the world building.