Even though I am disappointed to hear about the framerate issues, I am looking forward to playing through the campaigns in 1080p. I normally play through the campaigns solo on Legendary once very year or two, and I am definitely overdue. However, there are a number of areas throughout the game that I am not looking forward to, as they can be pretty grueling on Legendary. They are, off the top of my head, and in order:
Halo: CE
- Defending the first downed Pelican in Halo.
- Fighting the Hunters before boarding Truth and Reconciliation in Truth and Reconciliation.
- The first room after boarding Truth in Truth and Reconciliation.
- The first large-scale battle in Assault on the Control room, before getting the scorpion tank.
- The run up to Keyes and then the room Keyes is in, on the level Keyes.
Halo 2
- The docking bay in Cairo Station.
- Any time there is a Jackal sniper in Outskirts.
- The preceding the scarab in Metropolis.
- Pretty much the whole level Regret.
- The first area of Gravemind.
- The whole banshee part of The Great Journey.
- Tartarus.
Halo 3
Now I don't remember too much of Halo 3's Legendary campaign being as frustrating as the previous two games. Just a few parts really stick out in my mind as being rough.
- The final area of Sierra 117, before being exfiltrated.
- Any time there's Drones in Crow's Nest.
- The open area before getting on the final bit of highway to the cannon in Tsavo Highway.
- The final push on the anti-aircraft cannon in Tsavo Highway.
- Dealing with the stalker forms of the flood in Cortana.
- The first big area near the beginning of Halo.
Halo 4
- I don't remember the exact order of it, but it's a big area in Requiem with three buildings and lots of Prometheans and Covenant. I believe you can get a ghost.
- The big area in Infinity before meeting with Palmer.
- All of Reclaimer. Seriously, this level was brutal.
- There's a big open area in Composer that features a lot of Prometheans. And you can fall to your death.
- Any time you have to fight the constant waves of Promethan crawlers and the final area of Midnight.