To be blunt, your teacher should revise her views on cultural progress and stop considering only things of past as culturally worth-while. Its a common problem in perception, affecting not only education.
BioShock indeed has elements of Gothic novel, in big part because steam-punk convention is based on Victorian Gothic fiction. You have monumental ruins, you have mystery, insanity, murder, death, traps, contrasts that all were apparent in Gothic literature.
Now as for a game being a text. The fact it is interactive doesn't change that a game, with clearly presented plot is a text. The only issues one could have is with purely sandbox games where a player from start to end builds the story with just basic background provided. You could easily rewrite your whole gameplay in games like Bioshock into a novel.
BioShock indeed has elements of Gothic novel, in big part because steam-punk convention is based on Victorian Gothic fiction. You have monumental ruins, you have mystery, insanity, murder, death, traps, contrasts that all were apparent in Gothic literature.
Now as for a game being a text. The fact it is interactive doesn't change that a game, with clearly presented plot is a text. The only issues one could have is with purely sandbox games where a player from start to end builds the story with just basic background provided. You could easily rewrite your whole gameplay in games like Bioshock into a novel.