As an action game, HL games definitely succeed in giving the gamer action.
HL2: Episode 1's biggest problem is it's TOO much like HL2: Episode Zero. The physics puzzles, the weapons, the enemies, etc etc; there's barely anything new in Episode 1. It was, for the most part, a rehash of Episode Zero.
About HL games, sure -- there's a plot and all. Good luck digging for ALL of it, since a lot is cryptic and not able for you to assemble any pieces to try and assemble something out of it. It gives you a feel of "Wait until we here at Valve figure out where we want to take it to." Unfortunately, even though the characters have some depth to them, the plot really does lack it -- majorly. Worst of all, HL always tries to act like there's a lot there -- w/ long dialogues and expositions, that over add up to....nothing of much. At least Painkiller, which has no plot, knows what it is "there's no plot, we'll just throw crazy levels and shit at you to blow to kingdom come!"
About storytelling in HL, Often, it feels like a lot of things they just decide to pull out of their ass. HL games never seem to ever explain themselves -- but if they do explain it, it's usually quite late. For example, Episode Zero's cool ending isn't really explained at to why until Episode One actually OPENS. See, at the end of each HL episode/game, you will have new questions that leave you scratching your head. Unfortunately, they don't really give you any clues half the time of where it's going or actually put some of the pieces out there in any way to assemble a nice detailed story; a lot is still broken. Just try assembling something -- uh-oh, a lot of shit is still missing....
At least w/ FEAR (Original), hell -- even if ithe plot ain't spelled out 100% for you what's happening in your face, you definitely can assemble all of the questionable pieces together into something.
As an action FPS, Ep Two is great. And I do love the HL characters, too. But, unfortunately, seems like Valve still ain't great at story-depth.
Ep Two, at the base...
Y'know, just when I thought Eli Vance was about to explain some shit, Alyx comes in w/ tea...
And well, he says he'll explain things later.
I mean, WTF, Valve???