If it was going to be a typical Hollywood live action movie, with condensed time and sterile action it's not going to be a good idea.
First off you either have to make Gordon speak or make the main character a mute. The former will take away from the experience and the latter would just be awkward.
Then you have to make people feel engaged about some guy just wandering around shooting hapless monsters and soldiers.
Maybe a TV show (Which despite millions of fans and top talent like J.J. Abrams and Quentin Tarantino wanting to do a HL project, it'll probably never be greenlit.) and maybe an animated Half-Life.
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Halflife would be a great TV series if done right (like in the style, productions values of the newer BSG) One could probaly cover the story of HL1 and 2 in a 24 episode season. Maybe devote 6 to 8 episodes to the happenings of HL1 and the rest to HL2 (including ep1 and 2). Plenty of action fodder there....
A Half-Life 2 movie done in the style of Children of Men, with the single shot action scenes would be great. That's essentially what HL2 and Episode 1 are.