I have been revisiting MCC and after playing some multiplayer, yes it works, I decided to play some campaigns. While playing The Ark in H3 which is always great it got me thinking… Which is your favorite missions from the games or just your favorite in general?
HCE: Truth and Reconciliation
H2/H2A: Delta Halo
H3: The Ark
H4: Reclaimer
H5: Swords of Sanghelios
Some of my Favorite Missions from the following Halo games 
Halo CE: The Maw
Halo 2: Metropolis
Halo 3: The Storm
Halo 3 ODST: Uplift Reserve
Halo Reach: The Pillar of Autumn
H4: Midnight
Halo Wars: Arcadia Outskirts
HCE: Silent Cartographer
H2: Delta Halo
H3: The Ark
ODST: Oni Alpha Site
Reach: Sword Base
H4:Reclaimer
H5: Blue Team or Swords of Sanghelios
You have some of my favorites on there too
HaloCE:The library,on easy its fun,on harder difficultys I prefer The silent Cartographer
Halo2:Quarantin Zone,even on legendary.
Halo3:Cortana
Halo4: Midnight
Halo5:Genesis.
For me the best Mission of all time HAS GOT TO BE one of these:
Halo 3: The Covenant
The boss battle at the end with the double Scarab was a heck of fun. Slaying my way through the sandbox killing Brutes galore and also wrecking vehicles with quite a fun selection of power weapons across the halo sandbox was also great! Also brief but satisfying Flood bits to break the monotony.
Halo Reach: The Pillar of Autumn
The Mongoose section was amazing, speeding between Scarab legs and that jump at the bridge. Also loved the finale where you have to kill a ton of Brutes, face off the Zealots, then man the Mass Driver to shoot down the Covie ship.
Halo 3 ODST: Mombasa Streets
Technially not a standard halo campaign Mission, but still ranks as one of my most favourite, it was insane being the lone wolf and shooting through dark streets to kill hordes of Brutes solo.
My opinion on this constantly changes (how does one even CHOOSE, really?) but currently:
HCE / CEA - Two Betrayals
H2 / 2A - Delta Halo/Regret
H3 - The Ark
H3:ODST - Kikowani Station
Halo Wars - Beachhead
Halo: Reach - Tip of the Spear
Halo 4 - A tossup between Reclaimer and Midnight (that Broadsword run, tho!)
Halo 5: Guardians - Swords of Sanghelios/Alliance
Halo Wars 2: I haven’t finished it yet, but so far One Three Zero
Played on medium difficulties, my favorites that I could just replay over and over are probably:
Reach: Nightfall
CE: Silent Cartographer
2: Gravemind
ODST: NMPD HQ
3: Crow’s Nest
4: Composer
5: Blue Team
Not at all coincidentally, all Covenant-only missions. (IIRC.)
I really like the streets of New Mombasa in ODST. Bungie did such a good job creating an interesting, somber, rich space to navigate, and struck a great lonely tone. And of course, dat music – the absolute apex of O’Donnell’s time with the Haloverse.
Men there are so many.
- Halo CE: Two Betrayals. - Halo 2: The Gravemind. - Halo 3: The Covenant. - Halo 4: Requiem. - Halo Wars: The Flood. - Halo Reach: The Pillar of Autumn.I haven’t started the Halo 5 but I really want to play it.
Halo: Combat Evolved - Assault on the control room/343 guilty spark.
Halo 2 - Delta halo/high charity.
Halo 3 - The covenant.
Halo 3: ODST - kizingo boulevard/mombasa streets.
Halo: Wars - beachhead/ relic approach/ relic interior.
Halo: Reach - the package/ nightfall/ long night of solace.
these are what my favorite levels currently are though overall its more about the sections in levels than the overall levels so there is not really that much of a favorite levels for me since good parts are scattered throughout the game.
as for the HW2 im not really familiar enough with it to name best levels from it though it has some good moments.