Half-Life 2: Short Stories is a team working on a group of modifications that take place in the same realm. A lot of the focus is on the story and gameplay, new innovative set pieces and puzzles. After the release of the first episode of Human Error, the team is planning to release more episodes and expand the characters and the world.
Few mods pull of what this mod does. I have yet to play a mod that has combine gameplay better than this one. I love the section where you get to use the APC. Not to mention the multiplayer, which has new and original game modes. On top of gameplay I enjoyed the story. Though a few of the characters were less that pretty, it didn't really bother me all that much. It was also fun to get to see some enemies from Half-Life 1 reiterated in the source engine.
The awesomeness in this mod canbe summed up in one sentence: You get to drive an APC. You get all the badass weaponry a combine CP should have.
It has very few problems, but still some. Anders' girlfriend's character model is just horrible looking. The gameplay is solid, excpet for it's biggest problem. It was too easy. I didn't die once in the game, even when I changed the difficulty from normal to hard towards the end. Vortigaunts, grunts, and the super weak rebels all died instantly with the power of my shotgun.