Raven is pretty good. She got nerfed a bit, and today she got buffed, but less tanky.
This is the build I'm using, but its not optimized as I think I have a bit too much Range:
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The AM I'm using has red Crit Dmg, with Range and Cooldown. Ideally, you'd want Crit Dmg + Singular/Non-Attr Boost Ratio + Crit Rate, imo. For the AA mutant cell, I think most people use the Def Shred, but I'm using the Cohesion to buff more Non-Attr power.
With todays change, I think she is in a perfect stat for an active playstyle as her #3 now gives 2 Stacks of Raven Claw (the Orbs), but she only gets 3 dmg immune stacks vs. 7 before, so she'll have to be using her #3 on cooldown.