The snuke and bomb removal both happen after the surgery and the tape is hidden in the game and therefore not immediately obvious, so up until the surgery there isn't anything nearly as gory. The Achilles' heel+jack is the only other moment.
Also, with regards to your earlier mention of Horror films: It would be better to compare MGS to War films rather than Horror. War films, especially those that have an anti-war slant, tend to show the horror rather than hide it: Hamburger Hill, Full Metal Jacket, Apocalypse Now, Saving Private Ryan etc. The whole point is that viewers don't know what War is actually like and the film depicts for them the horror as realistically as possible> Why? Because war is always worse than we imagine: child soldiers, rape as a weapon of war/torture, battlefield surgery, the actual damage a gun can do etc. Are the films I listed not "clever" because of they depict the horrors of war in great detail...?