Signatures, imo, should fill in for weaknesses in a kit and add some bit of visual flair that feels impactful. The current signature doesn't really do either, and while it isn't necessarily ~bad~, it feels more like a normal skill than an impactful signature ability. Angela deserves a greater degree of flashiness considering her origin world where even exaggeration was exaggerated.
First, its issues: Clunky, misses often, forces you to realign your mouse in often uncomfortable positions (especially for those of us fighting carpal tunnel), the animation is unoriginal and is very tame for a super hero aRPG character based on a warrior Angel/Goddess.
What it should be: Considering she's missing her Lance:
Leap into air, grow wings, ephemeral lance, smash into ground, woosh mayhem massacre dead piles of suffering and a nice, large AoE which Angela is sorely lacking in.