What do you think of her as an actress?
She's a good looking girl and I've not heard anything bad about her personal life so I have no hard feelings towards her but honestly as an actress she's a charisma void.
I'm not one for slamming poor acting, half the movies I watch are low budget horror movies with 'poor acting' and I'm the sort of guy who thinks Gal Gadot is superb (she has charisma and I don't understand the poor acting criticisms) but from watching GOT and the X-men movies I have to say Sophie Turner just isn't that good of an actress.
Famke Janssen isn't exactly heralded as an brilliant acting talent, though I'm a big fan of her and think she does a great job is slightly comedic roles (GoldenEye, Deep Rising, The Faculty, House on Haunted Hill) but damn she's leagues better as Jean Grey than Sophie. The difference is night and day.
X-Men: Dark Phoenix is mediocre as hell and a large part of it is because Sophie was the lead and main character. She just wasn't cut out for it. Though I will say in her defence that Jessica Chastain and Jennifer Lawrence were meh in that movie too so perhaps the direction wasn't up to scratch.
Still I haven't been impressed by her acting at any point. She can't act for toffee, sorry to say.