NOTE: This is just a general overview and not a complete breakdown.
With that said, here are some pro/con aspects of the raid weapons.
[b]Pros:[/b]
* Deals bonus damage to Taken guaranteed.
*Cocoon ability allows for fluid gun-play(so long as 4 seconds have passed).
*Highest base attack value in the game currently.
[b]Cons:[/b]
*Primaries lack elements(First Raid to do so).
*Low stability and reload speed compared to other legendaries of the same gun class.
*Mediocre perks overall.
My personal input: The raid weapons are decent but not nearly worth the effort to get them. Their high attack value makes them more valuable as a resource than an actual weapon. As they are raid weapons, they should act ideally in a "swarmed" scenario. Thus, I recommend boosting the stability and reload speed of all the guns.
Feel free to give more input.
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Most likely the heroic primaries will be elemental. The reason the drop in normal is just to boost your light level up so you could do the heroic. Much like crota where only hard mode dropped primaries.