I have been a huge fan of destiny, and I owned both, and loved both. I personally believe that the vex and necrochasm should be back, but maybe do something to change them. Vex seems to always run out of ammo fast, so maybe make the fusion rifle ammo increase affect the vex more, or just increase its base ammo reserve. As for necrochasm, it's fine as it is.
Update: I'm amazed, there are so many people who want to have the raids and their guns back, thanks for all the support, and hopefully bungie will notice this.
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Titanfall 2!