Actually, most of the film is just above average, and the score would be like 7/10. However, the action sequences between Minute 100 and Minute 120 are incredibly brutal, realistic, bloody, traumatizing and unbearable, and are among the finest action scenes I've ever seen. Thus, I would give the film a 8.5/10 overall rating.
Similar to the Chris Nolan's "Dunkirk" and the action flick "Operation Mekong" in 2016, also directed by Dante Lam, this film "Operation Red Sea" sacrifices plot and character development for action, and fortunately it works. The cinematography, film editing, sound editing, sound mixing, visual effects, action choreography, original score and production design are just speechless. The film borrows ideas from several Hollywood blockbusters, such as the moral debate in "Saving Private Ryan", the special force fights of "Black Hawk Down", the war scenes at "Hacksaw Ridge", the tank battles from "Patton" and most importantly "American Sniper"'s sniping sequences.