Their mistake, as it were, was to continue to iterate on technology and not just content with each release. The right way to do episodic content is what Telltale did with Sam and Max where they don't iterate on tech and have a new episode out every month and a clearly thought out plan for the whole thing.
I really enjoy all the Half-Life games, but IMO Valve has shown exactly how not to do episodic content... the only reason they get a pass is because the result is so enjoyable.
I really enjoy all the Half-Life games, but IMO Valve has shown exactly how not to do episodic content... the only reason they get a pass is because the result is so enjoyable.