As you’re in the WP ecosystem, use it. There are already lots of plugins doing “review system” https://wordpress.org/plugins/search/reviews/
Find one which match the best your need and then improve it thanks to the filters and actions you can find in the plugin chosen.
–Edit–
If you do not want to use a plugin. I think a CPT is needed only if you want in your review a note + a review.
If you only need a note (1 to 5) then a post meta updated with the number of stars clicked (note given) should do the trick.
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