agentorange
Arcane
The other major reason the first game was better is how it revolves around a single place (the black mesa facility, if you ignore the shitty ending part on xen). Riding through the entire place on a tram in the intro, and then having to work your way back on foot really contributed to the immersion and atmosphere, similarly to how youw ork your way through the Von Braun in System Shock 2. Half-Life 2 lost that when they made the game take place in an entire city, and when you load from one place to another that feeling of cohesion and immersion is lost.
I don't agree with this. I thought that was one of the things HL2 did extremely well. It was set up like a classic Odyssey plot; Gordon arrives in City 17, gets teleported accidentally into Breen's office - which unbeknownst at the time is the eventual final destination of the game - then spends the entire game journeying along a massive detour that takes him back to that destination. I thought it was done very well as a continuous trek through all the various environments. Though the part taking place in City 17, on the return, is the worst part, very unmemorable and muddled.