The Library and Keyes were the only two levels with monster closet Flood spawns. Those were also arguably the only two bad levels in the game. Two Betrayals is awesome, (especially the final big battle for the Banshee) and The Maw is pretty decent too. The problem with Halo 2 is that on Legendary you were often forced to shoot enemies from a distance because getting close means you die within 3 plasma bolts. In Halo 1 this wasn't the case at all which makes it more enjoyable since you've got a lot more options.Halo:CE more fair than Halo 2? LOL. Halo 2 has Jackal snipers and dual wielding Elites. As far as I'm aware, there are no monster closets. Everything is spawned in and can subsequently be killed. Halo:CE has monster closets in every Flood level. It's fair in the sense of AI ability, but definitely not in terms numbers.
I'll say this, the first 5 missions of CE hold up pretty well after 11 years. But the last 5 are old, awful gameplay that can quite frankly die in a bottomless pit, and only the CE purists would give a shit.
Halo 1 campaign foh lief