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How is the Frankenstein "feel" bad for something that was literally created?
It's bad because it pulls the viewer out of the movie's world by reminding him/her of an insanely famous movie that was released in the real world ... not the world of Darth Vader. Making a reference to something as famous as Frankenstein is the kiss of death when you're trying to present "a galaxy far far away," but it's unforgivable when applied to a climactic scene.
Had that scene been successful, Vader's first steps would have formed a unique image, not the well-worn image of Frankenstein's Monster.
And becuse the Frankenstein scene is such a cliche, Vader's motions practically fall into the realm of parody. Plus, the monster motions look plain silly when executed by Vader.