Well they just got a flat damage buff (5 damage per bullet I believe), so some ARs may be quite decent again, especially on burst, I can think of a couple that I want to try again at least.
Might go testing on assignments before PvP though.
Edit;
Tested damage with M14, Steyr and G3A3 for a bit, the damage buff was definitely noticeable, especially when burst firing into large mobs, but I still think this role is better done by LMGs in almost all ways, aside from the generally slightly higher AP cost.
I don't really know, but perhaps giving ARs burst more range with much tighter spread, or the ability to do short targeted bursts on single targets might set them aside from LMGs, which generally outclass them when it comes to burst or full auto fire.