It's Half-Life 2, you've heard of it for a reason.
I played this game for the first time in 2015, 11 years after release. My thoughts then are the same as they are now - while graphically it has not aged well, the tech behind the physics of this game and the purity of the gunplay mean that HL2 is still an absolute must-play for anyone who hasn't tried it. I 100%'d HL2 yesterday and it is still absolutely fantastic. If you have never played this game, you owe it to yourself and to gaming as a whole to play this leviathan title.
9/10