Oh, CGI, you can be a marvel, your computer-generated imagery taking moviegoers to imaginative worlds in sci-fi, horror, fantasy, and superhero films. And oh, CGI, you can be a mess, especially when you try to re-create faces in films. The worst CGI faces make even some of our best actors look like they've had way to much plastic surgery, or swallowed rubber for breakfast.
CGI faces in the movies might be the result of trying to de-age an actor, such as Arnold Schwarzenegger in Terminator: Genisys, or Patrick Stewart and Ian McKellan in X-Men: The Last Stand. Goodbye wrinkles, hello synthetic doll face.
In other cases an actor morphs into another creature or form, such as Dwayne Johnson in The Mummy Returns and Uma Therman in Percy Jackson & The Olympians: The Lightning Thief. Combining reality and CGI doesn't always go well, however, and thus The Scorpion King became all CGI and no The Rock; Medusa became Thurman's true face attached in an odd touched-up way to her slithering hair. Or in the case of Wesley Snipes in Blade: Trinity, he might have refused to open his eyes in one scene, so the visual-effects crew gave him CGI peepers instead.
Moviemakers do such magic with CGI most of the time that it doesn't seem fair to point out their lesser work. But these flawed attempts at flawless faces can ruin a scene by making a character look beyond what is acceptable for fake in a film.