I finished up Episode 0. Nova Prospekt was kind of a bore, but watching those ant lions chew through the jail and pop up and help you fight some bad asses was swell. I literally felt thrilled when I realized that they'd followed me in. Also, great gaming moment: The shilouettes of Antlions swarming a guard tower against a full moon. The following sewer/warehouse-y stuff was kind of a snooze, but the very end where Alyx is reworking the portal and all you hear is BOOM BOOM BOOM as the enemies are kicking in the door was a stunner, total gold.
I adored the uprising and another subtle genre shift to squad based shooter. Too bad the squads felt shoe horned in. They rarely follow orders, are absolutely replaceable and often seem to only function as bait. I liked having them around, but they were way too disposable. Still, a shift towards urban combat ala GRAW was cute. The strider battles were fun, although the one outside the museum was far too long. But watching Dog come busting through a barricade at the last moment was killer.
The citadel looked like a Halo level. Take that as you will. Becoming a walking man-god was delightful, although I would have been pissed that that was "it" if I didn't have Episode 1 and 2 available. The end was neat with the time-pause and the start of Episode 1 is engaging, although I think I'm gonna take a break before I continue on. I have Ace Combat 6 and Battle for Middle Earth 2 sitting on the table, untouched.
All in all, I can't remember the last time I had this much fun playing a video game. It just kept throwing exciting shit at you every 10 minutes. I'm usually sort of moderate in the amount of time I sit down and play, but I just couldn't keep from filling every free moment with HL2. What's the general feel on Ep1?