Save anytime, anywhere makes for an awful game with zero challenge. The story is actually pretty good by games standards at least. http://agoners.wordpress.com/2009/11/08/saving-anywhere-costs-you-half-a-life/
You cannot fully enjoy Half-Life 2 if you do not play the games in order. This game is such a classic that I enjoy it more than I enjoy playing its second version. I can't stop playing the first, the graphics are amazing for a game in its time, the length is satisfiying, and the plot is extremely well-crafted. I recommend this game for everyone, 11/10.
Its freaking half life. One of the games one must play (maybe not beat) to call them self a gamer. I have not beaten it, but I got rather far in it, and I can say, its a great game that should be played by most. The graphics have not aged well, but few have, but the game play is still there. Lots of variety of game play; some stealth, some running and shooting, and some puzzle. Its a great game.
Really fun game. I bought it after I played Half-Life 2 and even though it is a graphical downgrade I still have a blast. The story unfolds from a first-person perspective and it is one of the few FPSs that has platforming (the jump button is actually used for more than trying to dodge) and some puzzle-solving. It is nice and varied. Very well-executed.
Even though the game is old. It is held with such a high regard that hundreds of people have gotten together to make this:
http://www.youtube.com/watch?v=G32_q_3es8E
Black Mesa. The complete remake of Half Life for newer audiences that don't quite like the older graphics.
Half Life has one of the best stories, It is behind the greatest engine, and produces the greatest games and mods. Nothing compares to VALVe and their Steam distribution system.