What you are seeing, Mr. Freeman, is not real.
H-L - The Matrix? G-Man reminds me of Agent Smith, come to think about it.
Instead of the awesome lobby scene with the guns and crap, gordon takes on all of the hgrunts with his...crowbar! mwahaha!
And if they used Hawking, he'd be Dr. Keller. The wheelchair says it all.
And methinks Depp would ditch the crowbar for.....scissorhands! lol.
And Judo-Gordon would be awesome.
And part of what made the whole Half-Life (heh) premise fun was that you were immersed in the game, controlling Freeman, and the world came alive around you. I doubt they could replicate that in a movie form unless it was shown from Gordon's POV, but then it'd be like another HL expansion, just non-interactive. And on a big screen. And with popcorn. Mmm....popcorn.
And I'm done. For now.