I've never liked Half Life 2, as a game. The enemies are bullet sponges, guns feel weak, levels design is generally over-reliant on gimmicks like the gravity gun, explosive barrels and vehicles in combination with the obligatory physics puzzles. Cutscenes weren't separated from the gameplay, but so what? You get to jump around and throw objects while characters participating in the scene pretend that you don't exist. Being able to play with the physics isn't an adequate apology for having to sit through these scenes when you would much rather be playing the game.
The setting was clearly modeled around dystopian fiction but the game failed to have a coherent or meaningful narrative. Even something like Final Fantasy 7, with its absolute nonsense of a setting, presented its themes in such a way that they had an impact, whereas Half Life 2 flirts with the dystopian trappings and nothing more. It says nothing. I'm happy that, as a franchise, it's dead.
Keep in mind that I'm exactly the sort of person who has every reason to love this game. Back in 2004, when it released, a friend invited me over and I watched him play the game on his PC. Compared to the PS2 I had at home, the graphics were incredible, higher resolution than anything I had seen before and I remember being amazed by the appearance of water in the game. It single-handly got me interested in PC gaming, and I'm still massively interested in computer hardware to this day.
I just don't like HL2 and don't think that it holds up. It was a technological advance and an incredible effort but it's not a good game. I'd rate the Riddick game of that year higher in terms of gameplay, to be honest. Then the next year, FEAR came out, and was impressive in both technical and gameplay terms (although less so in terms of the breadth of environmental assets).