oops, by the time I was done posting there were more replies.
Hey Big, I thought the first 3/4 of halflife was cool as shit, and then it sucked a big dick. It got too wierd and all that teleporting shit sucked. The ending was a real let down. i thought the marines or someone would tell me what the hell happened. The last 1/4 pretty much ruined the game for me, i liked shooting the soldiers and killing the lab guys when I was done with them by shooting them in the face with the shotgun, more than killing wierd alien things.