(Played via the Master Chief Collection on Steam, Normal difficulty, mostly used Old graphics)
I really dug going back to this. The weapons are a blast to use, the story and writing was surprisingly good, especially Cortana and her interactions with Chief, and the levels are pretty well designed...mostly.
Yeah later on the game can get kinda irritating to play, special shoutouts to Assualt on the Control Room and The Library for being especially repetitive and hard. Also the grenade throwing in the last level felt way too precise.
But yeah, this is a great time and you should give it a shot.