Just finished it... or at least what they had of it released. Cannot wait for Xen.
Unlike seemingly the entire rest of the fanbase, I liked Xen, so I'm excited to see what these guys are doing with it. The rest of the game looked incredibly shiny, and I love that they shortened some areas that just went on FOREVER in the original (On the Rails, Surface Tension).
My main complaint is the jumping physics. I died more times to the ****ing jumping controls than every kind of enemy combined. Yeah, I know, Source engine, realism, blah blah blah. But IMO, the Source engine wasn't built to handle the platforming sections Half-Life 1 had. I don't care how realistic it is, I want to be able to jump on top of objects without having to press an extra button
every single time! Is there any place in the ENTIRE game that jumping without crouching was useful? Why didn't they just map a crouch to the jump controls automatically? It would have made things a lot less frustrating.
EDIT: Just looked back through the thread. Glad I'm not the only one who thinks crouch-jumping is complete ****.

I digress (I'm probably so worked up over it because I just finished the Lambda Labs, which has a lot of jumping). On the whole, I love this remake. The updated graphics are incredible, the set pieces add to the overall atmosphere nicely (Black Mesa looks like someplace someone might actually work now), and everything's a lot more consistent with HL2 and its sequels. So, I'm really excited to see what Xen and the Nihilanth will be like.