I like it, in fact I like so much that I even bought Sin Episodes and can't wait for the next one.
As for the value Half-Life: Episode 2 will come with team fortress and portals, that will probably have for entertainment than most of the full-priced games available.
That said I'm very interested to find out how the Sam and Max release plan will work (every month).
Also, I think Fahrenheit would have worked better is it had sticked to the original plan, they would have more time to develop the last part of the game instead of that rushed "lets stick everything we've got".