QfG4 is my favourite QfG game, with QfG2 taking very close second. Every class gets something meaningful to do here (except the poor old fighter -- all he can do is defeat monsters).
Well-crafted music, as always. The Rusalka Theme is interesting - it creates a mix of innocence and dread, very appropriate. The Monastery Theme is apprpriate too, with its emphasis on bells creating fear. But every theme is good here.