There it is. The Addon the world was waiting for. As almost every PC-Gamer on Earth played Half-Life², the bar was set up high for Half-Life Episode 1.
First of all, i would like to argue about Steam. The platform, which contains all of the Valve games, is crappy at all. When I buy a game, i would loke to play it, not download an Upgrade before i play. And the most annoying thing about it is that it does not always upgrade before you can play. There was a problem that Steam started the update during the game, and then the game crashed. This is not a good support Valve!
But now let us come to the game. All in all, there are 0 changes to the original game. Everything you saw in Half Life 2, you will see in Episode 1 again. There are no new weapons; except for one monster there are no new enemies and even the gameplay with the physic puzzles seem to be just taken from the original version. Because Half Life 2 was one of the most electrifying games of all time episode 1 has to prove to be worthy to be a Valve product as HL2. But this proof is not given by episode 1. It cannot because again the game is the same as HL2 but without the WOW-effect as HL2 gave to the users who played it for the first time. The AI which was not good even in HL2 has not improved that much that it would make this a point in which episode 1 beats HL2. The only thing i agree with this product is its price. But the playtime is about 4-6 hours as you play on hard or on the easy mode. If you ask me the game is far too easy and there were only some passages which made me die more than once.
So if you are addicted to Half Life this game is a must have, but as a usual gamer who already played HL2 it is not necessary to buy this game. If you have not played HL2 I would not recommend that you start witht the addon though it would be possible to play the game without HL2, but then the story of episode one is not understandable because there is no review to the story of HL2 in the beginning in episode 1!