Heyyo,
Err.. HL3 is already in the makings I believe...
Sure, Doom3 has actual storyline (for a change), but HL2 storyline's pretty good too... but you need to like, know it before any of it actually makes sense. Like, those newsclippings of 'the 7th war' and how 'earth surrenders' diddn't really make sense. But yeah, read that link I pasted on the 1st page of this thread, and it'll make a lot of sense.