Well, its too short, thats for sure. Plus the plot sucked, there was no big monster to dispose of half way through, the gun battles were few and far between, the AI of the soldiers wasnt that good compared to HL and OpFor, the appearance of aliens was too predictable. It just ended with no big battle at the end, and no major objective to achieve. I downloaded better single player missions from the web. If you love HL, then you might as well buy it, but its no OpFor.