it all depends on how much of the game they have completed.. right..?
Now quite, for me it's up to mr Scott and his hillarious humor.. well AND Gordon Freeman of course. Now what is good in HL1-OldStyle? The gameplay? Yes! But its a movie fellas!!! Last 31th Ep there Ross jumped of the train was like a bomb for some fans, and a bad one. Now what else is important - right! Memories and predictebility - sure its cool watching a guy saying funny stuff walking though game you have already been though, but BM is not different game - just little different propmodels are a little misplaced, and as we see on screens there are quite all the same. and still, if you feel uncomfortable -> you can play BM through and continue watching FM
So fellas, i personally fell to that 1st april joke and well was disappointed, and now, i'm rly happy to see any FM episode coming out.
p.s. Beside that - mr. Scott uses noclip, cheats, cuts video and uses supereffects! Doesn't it ruin great movie? hrhrhrhr, not for me