I haven’t finished a playthrough enough to give a full review, but I just beat The Library and the mod so far is fantastic.

It makes a number of both subtle and obvious tweaks. It adds numerous new lore friendly enemy types, which is especially welcome with the flood as it makes them less of a boring slog to fight. It adds ODSTs alongside the normal marines. I really like the ODST visual which is at home with CE.

It adds new weapons to the CE campaign like a flame thrower (although to be honest I rarely use it due to how fast it goes through ammo) and sentinel energy beam guns that can be used. It even brings the covenant energy sword to CE.

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The library didn’t feel nearly as bad as vanilla, with a lot of tweaks given to it.

There are invisible changes too like the assault rifle’s initial spread being way reduced, making it actually usable at midrange with short bursts. Hunters have been tweaked so that one pistol shot to their orange bit doesn’t kill them. Warhog handling is better, with is accelerating much faster, and marines will now even drive unoccupied warthogs to follow you.

Big recommend of this mod for a replay of CE, it’s avaliable on the Steam Workshop page.