boringnickname
Rear Admiral
The benefit of licensing a video game IP for your movie/series instead of something you create is name recognition. Ie, Disney is willing to develop an action movie as 'Prince of Persia' because the game sold x-million copies and their surveys show people are familiar with the name (and in exchange they lose some profit--there's fewer licensing options available and you will have some profit sharing agreement in order to get the name.)
Archmedian Dynasty is a great, great game... but I'd be surprised if most ordinary gamers had heard of it, and much more surprised if it had sales numbers that would impress a movie producer.
Well, you're right. Unfortunately.
AD had the best underwater setting I've seen(except the bionts, too cliched), Seaquest is toothless compared to it (sorry SQ fans).
An AD movie/show done right could finally break the "based on videogame = bad" stigma.