So, aside from Halo and Doom, Half-Life has been another one of the most influential FPS's of all time, not just for its immersive storytelling, but its unique cast of characters and its failure to count to 3.
Gordon Freeman has a lot of tools in his arsenal, which
FeliciaFan took the time and energy to build. TL;DR: he doesn't just use the signature Crowbar, but a large variety of weapons such as the Crossbow and the shotgun, but there's also the world-renowned Gravity Gun, which can grab props and rockets and throw them back at enemies. And before you cast doubt on his conclusion, IIRC Gabe Newell said he'd be fine with any of their properties in Smash. Whether that results in having Chell from Portal as a Mii Gunner or a Spirit Event based on Valve properties, this does give a ray of hope.
NOMS:
Saber x15