Thunderlord is great and everything. However, it sucks that the only way I'm going to use a machine gun is if I sacrifice my exotic slot. I wish they would have introduced at least three other machine guns into the game when they released thunderlord.
Also (my opinion) thunderlord isn't that good.
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Except for Malfeasance, and sometimes Chaperone or Trinity Ghoul, I rarely have an Exotic equipped that isnt a heavy. If they dont nerf Thunderlord, it'll occupy that slot on 1 character at least for a long time. The MG has always been a favorite of mine. I cant wait for the Legendaries so I can customize my loadouts with the above mentioned small arms exotics.