I love Source Engine games and mods, my favorite is G-String. I also do some modding/developing.
Fantastic story and puzzles, even though there is almost no English audio and the subtitles can be incorrect the story the creators are trying to tell is fascinating!
I think Leon did a good job on the mod yet the problem I find with it is that it just doesn't have a Half-Life feel to it much at all. I'm okay with some of the changes then others like the combine don't make sense, at least make a story around why these things have suddenly changed then it would make more sense and I would have given this mod a higher rating but overall it is a good mod I hope Leon doesn't get trashed for the lack of HL theme.
This mod defined my childhood. I will never forget the impact it had on me and still has.