'Moving the story forward' is not something that Valve does well. What they do well is gameplay and graphics.
HL1 was a good game that left us with many questions. HL2 answered none of them and raised about a thousand more.
I'll wait until all the EP's are out, then wait 1 year more, then buy the disc with all 3 in the bargain bin for $29. Whatever I find in them I know it won't resolve jack sh|t storywise. "Moving the story forward", Gabe has some nerve. Seriously.