If i would make Movie Adaptions, i would choose the Silent Hill Franchise.
I would use some CGI Monsters but some of the bosses from the game would be like reallife size puppets like in Aliens or The Thing.
I would keep all the talking sequences from the Games but maybe add some characters, that instead of exploring all the locations like in the game ( which would take to long ) that sometimes just new members of the Cult or such would give the Main Character some information about whats going on.
Also i would like to add scenes in which the Monsters are fighting each other sometimes, instead of just the protagonist.
And the Cult Members in the Movie would even have powers to control the nightmare world.
I would adapt the main series as liveaction and if they will be sucessful, i would add a Spinoff Tv Series in animestyle which would adapt the graphic Novels of Silent Hill and Spinoff Games.
And by Silent Hill 2, i would also make a minimovie based on Scenario B on The Directors Cut version and would only release it on later dvds as the Directors Cut Version of the Movie, like the game did