I really liked the way FEAR handled SciFi. The escalation of paranormal and scifi elements went along nicely. You start off with that big hit of science gone wrong in the beginning, coupled with the whole introduction horror bit, which gives you an indication on how far the story will take things, but after that is is a slow and scary creeping forwards.
From pistols to SMGs to shotguns to laser zappers, zappy drones and underground super secrit duper reactor powered ghost facilities, from scary sounds to dark hallways, mind controlled soldiers, premonitions, hallucinations and finally ghosts and a demon child.
They really do manage to connect science fiction and horror, making you constantly question if something is supernatural or just so advanced that it appears like magic to you. In the end you begin to question if there even is a difference, or if science and dark magic things are just difference sides of the same object.