I had the same impression as when I watched the movie based on Ten Miles of Peach Blossoms. Trying to complete a series in a few hours can be a headache. I don't think the director has done worse than the director of the other film, too much information in a short time can make a good story stick with the plot.
I didn't think the performance was bad, the actors did what the script said, whether they liked it or not. Xiaofan's personality for Wei Wuxian may have been a shock if people came straight from The Untemad, but it should be noted that the two characters are completely different, and from what Xiao Zhan's performance has been, he followed the script . I think his acting skills are very good, being a brave character or not, smart or not, he got into the character and did what the character required to be done.