I'd say the genre of total recall can be pretty much either, action/sci fi seems a good way to put it. i'm a huge sci fi geek so i'm not afraid to call it sci fi, but with the over the top action and overall feel it'd be crazy to call it just sci fi or considering all the space/tech/etc it'd be crazy just to call it action.
i'd say true sci fi that has a similar dilemma to this would be starship troopers. there is a lot of action and whatnot but the main point really is the plot/environment/characters and the action ties the story of the humans vs bugs together. with total recall the movie its a lot about arnold just kicking ass and getting back at those who wronged him, with the sci fi being the setting and secondary part.
in the end it doesn't matter though, total recall kicks ass, the book kicks ass and the remake will lick ass.