The only one I've seen in Crucible and Iron Banner since the update is the Suros Regime. I don't really care if they are changed for PvP because I have Red Death and the Vex but I would like to see them improved for PvE. There's no reason they should be ineffective against thrawls.
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AR are outclassed short, mid, and long rang. You are literally playing at a disadvantage using one. Some players skill may compensate for it but I would guess most just get outgunned. I think it's kind of pathetic that bungie used time and money developing different AR just to nerf them into the ground. Then they continue to offer them as rewards for new factions, because we're going to use them? I would love to see another weapon graph on weapon usages in PVP and PVE. Let's see how the "weapon balance" is doing.