I'm in the middle of Cairo Station. Frankly, it isn't fun in the slightest. Elites are near impossible to take down, owing to the fact that they can kill you in one burst, immediately run into cover when they get shot and take more than an entire BR clip to just knock out their shields. Unless you are using a pistol+plasma pistol dual wield you won't be able to knock out their shields and headshot them before they can get to cover. AND THIS IS THE FIRST MISSION.
Thoughts/help?
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The first mission is awful on solo legendary, but after that, the game isn't too difficult. You can get through any sniper alley with a lot of patience. But then the difficulty skyrockets when you get to Gravemind. It's honestly one of the hardest missions in any Halo. Just getting past the first room can be a pain.