Why don't some people like the 10 Commandments?

The movie is based upon a pastiche of several books that attempted to add believable, relatable, intimate human drama to a famous legend, resulting in a movie that is epic in its perverse improbability—which is the only thing that keeps it from being epic on the merits of its perverse contrivances.

Q: Why don't some people like the 10 Commandments?

There are several reasons.

See the moon shine with famous red star Antares in the southern sky on June 9 - Space

The subtle menace of Vincent Price and John Carradine would have been better deployed in horror or suspense movies.

Charlton Heston was just marking time until he reached his peak in Planet of the Apes and Soylent Green.

It should have been an opera.

Rocks reveal the turning point when oxygen changed Earth forever - Earth.com

Cecil B. DeMille—never one to settle for a good ripping yarn—tarted up this good ripping yarn with every device, technique, and name-brand face he could get his hands on. If he had lived long enough, he would have inserted the Super Bowl into the Academy Award ceremonies to give them a little pizzazz. This movie has more pizzazz in its eye make-up than most movies have on premiere night.

Yvonne De Carlo failed to project the gravitas that would serve her so well on The Munsters.