I think they kinda wasted a lot of potential with Lilith in making her this stereotypical cartoon villain. It's a shame because I loved her design & voice actress.
I also hated when we tell Elias that we took care of his finger, instead of just yanking him another time and be done with it, or showing Inarius the freaking soul stone, for absolutely no reason, which we knew he would have strong feelings about. It's like Azmodan & Diablo telling us their plan in D3 types of stupid. And of course in both cases it completely backfired, just like it did for the big bad evils in D3. And then we let a kid, influenced by Mephisto, run away with the damn thing and don't even attempt to get after her.