I think the over all theme to Movie Bob's list was: Don't make a movie based on a game that already exist.
My theory on the old notion that "No movie based on a game is good, no game based on a movie is good" is that good movies for games already exist, they just were never intended to be based on each other or advertised as such.
There would be too many examples if I listed out good horror movies being basically the same premise as a particular horror game, so let me pick a game series that is less obvious: Final Fantasy.
A good Final Fantasy movie does exist, it's called "The Fifth Element." Think about it, four magical stones of the elements assisting an ancient being and a team of heroes, which include an ex-soldier, a bard, a priest, and a young fool, to stop an evil being, taking on the form of a moon like asteroid and aided by a greedy villain, from destroying the world. Oh, and there's an opera scene. Sort of calling the head scientist Cid and naming the air ships after Chocobos or summons, the movie is probably the best union of elements form every Final Fantasy game one could hope to create.
Maybe if movie makers stopped trying to do tie-ins and just focus on doing the best creative work they could, they would incidentally create all of the movies based on games you like to see ...eventually. And if not, well at least they could pull off something that could stand on its own, without carrying all of the baggage that comes with trying to make a 2 hour film contain the plot and characters of a 60+ hour game.