Shauna was already jerk in previous seasons for various reasons, but now grief and trauma have made her vile and dangerous. I simultaneously understand how circumstances have driven her in this direction while hating her for what she's doing.
But it's entertaining to watch, at least for me–I'm actually loving it from a storytelling and character development perspective.
Kudos to Sophie Nelisse, as always.

I usually love Shauna but she pissed me off. The vote wasn't fair because she had them all scared. Ben is going to die because she was acting like an asshole. I don't believe he started the fire.
Why did Lottie die like that? They should have showed her falling or something.

That death came out of no where. I don't think I agree with the way the writers did it, and I'm usually on board with their other controversial choices. Jeff's obsession with karma also seemed rather sudden and random.
As for Ben, I think that after the trial they are probably going to kill him. Too bad, because the team could use that box of rations and tools he uncovered.