Named Game of the Year by over 50 publications, Valve's debut title blends action and adventure with award-winning technology to create a frighteningly realistic world where players must think to survive. Also includes an exciting multiplayer mode that allows you to play against friends and enemies ...
Guys, if you havan't played it yet, now it's your time. The game is absolutely fantastic. It has one of the best level designs I've ever seen in a game
Black Mesa is missing nothing from the original, polished every single aspect of the game to a beautiful shine and it's relatively cheap. You aren't missing anything, it should be considered the definitive way to play the original now IMO.
I've only ever played HL2 on Orange Box on xbox, but I'm definitely thinking I might have to try the original because I remember HL2 being a good time, for the most part.
If you haven't played HL1 before and you end up enjoying it and you have the money to spare; give Black Mesa a try. For my money it's the best remake any game has ever received and the fact that it was done by fans is astonishing when you see the level of polish that went into it.