That's why their not worth the time obtaining. Also the only raid weapon that I would even consider exotic is pre-nerf black hammer but whatever the raid weapons suck now that's why you never hear players saying "omg I got a doom of chelchis".
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Smite of Merain - Pulse Rifle Silence of A'arn - Shotgun Qulium's Terminus - Machine Gun All of these are good raid weapons. The pulse rifle can roll Firefly (which I have) and it is a monster. The shotgun has a fast fire rate and having the perk Life Leech is really good for successive kills. The machine gun is obviously good, regardless of perks.