nope. it’s not a “direct port”. The multiplayer maps are different. In my opinion the original HL1 maps where better and there are a few other things that are diffetent from HL1. The MP5 has a stronger recoil for example. Unlike HL2 or HL1. When you fire a whole clip without doing pauses, your view tildes up and down… and thats total crap. another example is the laggy movement. you cant jump through the map smoothly. that really disturbs (I even think it destroys) the complete feeling what HL1 had.
PS: I own HL:S, played HL1 and HL:S and I’m a hardcore hl1 fan… so… please accept that I’m right.