Maybe it's just a personal affection for this screen version of the Mika Waltari novel, or a fondness for things Egyptian (I grew up loving to visit the mummies in Boston's Museum of Fine Arts) but I think this is a rather good film. The production values are great regarding color and cinematography, and it appears some effort went into historical authenticity (much of it from the novel, I'm sure).
Purdom is admittedly a bit stiff in the lead role, but one can accept this as part of Sinuhe's character. Victor Mature is, well, Victor Mature. Peter Ustinov is a delight to watch here , in the type of role which he always did so well and so wittily. Bella Darvi's performance as Nefer is classically camp, and I find even Michael Wilding's rather dry portrayal of Akhenaten to have its own appeal.
The historical oddity of Akhenaten's monotheism, a brief detour in
ancient Egypt's history, is interesting, as is Akhenaten himself, and well worth reading about; the religious wars portrayed here have a basis in fact.
An interesting footnote regarding Darvi, whose birth name was Bayla Wegier: she was a Polish émigré who producer Darryl Zanuck and his wife Virginia took under their wing (I believe they may even have adopted her). Her screen name Darvi is formed from Zannuck's and his wife's first names. She continued her acting career in France, but never achieved great success and, after a rather unhappy life, died at her own hand in 1971.
Altogether this is an interesting film and enjoyable to watch both for the visual values and for the history. Turner Classic Movies shows this in letterbox, which is essential to capturing the scope and sweep of the story.