Best part is, GGP was most likely a sarcastic remark. A tongue in cheek reference to the fact that valve has talked about a mass-produced Steambox for years now, yet nothing has hit the market.
And isn't likely to happen in the near future, either, considering that they basically canned their entire hardware department for over a corporate culture conflict.
If you want to make a damned movie, get in the movie business! If you want to make GAMES then make them FUN!
There's nothing inherently wrong with cinematic games, though. Compare a snore-fest like LA Noire to the Mass Effect series. Both are very cinematic, but in Mass Effect, what you're doing feels like it matters. you're having fun because you're playing it. LA Noire was a barely-interactive 20 hour movie which ground onward inevitably with or without you.
System checkpoint complete.