Originally posted by: Schadenfroh
Vampire: The Masquerade ? Bloodlines is the only FPS / RPG hybrid that I have found that is better than Deus Ex, IMO.
It uses the half-life 2 (source) engine and is available on steam, but do use the latest official and community patches... it is rather buggy and missing a sizable amount of content because Activision downsized half the company about 6-months before release and forced it to ship before it was complete and fully tested.
It is modern day, not science fiction though. If you are familiar with the fallout 1 and 2 games, it is the same inner circle developing Vampire: Bloodlines (they founded Troika after Black Isle Studios got liquidated)