I haven't played the first one, but I'm currently sitting on the second one (actually just stopped playing for a few minutes to watch ZP ...).
And what strikes me as odd is that many of the things Yahtzee complains about in "modern", "realistic" shooters actually come from HL2, a game he fucking worships.
I started the game with a bunch of things in the back of my mind that I heard about the game, such as the great story, the great storytelling, the fact that there's no cutscenes etc.
Now the story is as clichéd and tired as you can get. Earth gets overrun, Messiah arrives, Earth gets taken back (I s'pose, currently I'm branded "Anti-Citizen One" and haven't taken back much). I've never felt really invested; HL2 is not a game I keep playing because I breathlessly wait for the next crazy turn or development the story will take.
And the fact that the cutscenes don't cut to a scene but force me to watch the tedious dialogue without ever leaving the perspective of Gordon, thus making him even more of a non-character than he already is doesn't improve matters much.
And they ARE cutscenes; in Nova Prospekt, at the end, I was shooting round after round of my pistol in Mossmanns back, but I couldn't change a thing. That's a cutscene; a cutscene that's depending on you watching what is important to watch instead of showing you.
And Gordon is not a character, he's, to paraphrase YZ talking about Mario, a tool the Resistance use to ward off evil.
The other characters in the story tell you where to go and what to do, and then you simply follow their orders; I don't feel like I'm pushing the Combine back or doing anything worthwhile, I'm just trudging from Point A to Point B while shooting hordes of baddies while everyone else merrily plots along.
Even fucking CoD 4 made me feel like I'm making more of an impact than HL2.
Don't get me wrong, the shooting is fun, and the graphics are great, and it is fun to mindlessly drive along the highway and blast people away or send a bunch of Antlions to eat everything I don't like, but I just can't understand all the hype around the game.
But maybe the first part was better, if some of the comments here are to be trusted.