These kind of lists are a dime-a-dozen on the internet nowadays, but this one has some pretty valid observations.
10 Best Sci-Fi Films That Never Existed

I personally appreciated their observation concerning the HITCHHIKER'S GUIDE film...
There was a movie that perfectly captured the Douglas Adams experience, the combination of bitter sarcasm and sharp imagination, the droll British wit and whale-exploding slapstick that infused his novels. And that movie was Shaun of the Dead.

ps. I sure hope that the HALF LIFE/Quentin Tarantino thing is just a joke! My tenuous respect for Hollywood wouldn't survive it.