I've only played two chapters in, but here are my opinions of BM:S so far.
The developers did a great job updating the levels of the original Half-Life, though for some reason they're not quite as intuitive to play this time around, at least in my opinion.
The music is really good, and is more emotional and somber than in the original game.
Voice acting is.. good enough, I suppose, though nothing to write home about.
Of note is the voice of the security guards, with the voice actor pulling off a really convincing impression of Barney Calhoun. It's just a shame that he uses that same voice to portray Eli..
webepoop said:
The movement feels a bit weird as well, whenever you strafe the camera angles a little, but I got used to it.
I don't know if this has been mentioned already, but you can adjust that in-game. Go into Options>Black Mesa, and either lower the View Roll, or click Disable View Bob.