Yeah, fairly good, but the plot was terrible.
For a portal submission, it was good, but like I said, the plot was awful. The stick guy didn't do anything (it was a nice twist, but still pointless), most of the jokes didn't really work, too much time was spent on stuff that didn't need time spent, and there was just generally no character development or anything. Just a generic 'mission' plot.
On the other hand, it's refreshing to see a plot like that that doesn't try to justify itself by putting in a whole bunch of BS explanations. I guess it could be considered a parody. Sort of. Except that it doesn't really parody anything very well as far as I can tell. Except HL2, that bit at the end was pretty good.