Ed Zitron's given his thoughts on GPT-5's dumpster fire launch:

Personally, I can see his point - the Duke Nukem Forever levels of hype around GPT-5 set the promptfondlers up for Duke Nukem Forever levels of disappointment with GPT-5, and the "deaths" of their AI waifus/therapists this has killed whatever dopamine delivery mechanisms they've set up for themselves.
In a literal sense, Google did attempt to make GPT Doom, and failed (i.e. a large language model can't run Doom).
In a metaphorical sense, the AI equivalent to Doom was probably AI Dungeon, a roleplay-focused chatbot viewed as quite impressive when it released in 2020.