Why does Julie Andrews's Greatest Christmas Songs only have three out of five stars despite having a glowing review?

Honestly, the review is positive but not necessarily raving, It states that the collection takes different songs from different eras and compiles them together. The review praises her voice and says that the album is "worthwhile for Andrews fans" and then gives it an average / above average rating.

We also review two other Julie Andrews Christmas albums, with slightly higher ratings:

https://www.allmusic.com/album/a-christmas-treasure-mw0000315612

https://www.allmusic.com/album/christmas-with-julie-andrews-mw0000188956