My opinion of Hien Madoka has improved. Her Engrish is still strange and the little vibrato she uses isn't to my taste for many ballads.
But there are songs where her clear voice shines. For instance, this is the best version of Sakura Taisen's opening from a vtuber yet.
https://www.youtube.com/watch?v=JPXS5gvcxhM&t=3077s