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The **** is this ****?!
For a free mod I wasn't really expecting much, but I was blown away by a proper campaign with an actual story!
I liked most of this mod, some parts did feel a little bit out of place or poor, but for the most part it was an enjoyable ride and it ate up 3 hours of my time so I can't really complain!
However the voice acting was poor and didn't do the best job at keeping me engaged, but I did stick with it. The G-Man felt out of place and it was surprising to see him in the game.
Overall: 8/10. Good mod, held back because of poor voice acting, but overall it was enjoyable.
EDIT: I played this on a 2014 machine running Windows 10, from what I've been reading it seems like you think it is unplayable, but I managed it by using the 2010 patch and I didn't have any problems whatsoever!