The game can get a little gitchy too.
Right after I made my prior post, the game froze up on me. While normally this wouldn't be horrible (annoying? very) as you just reset the system and load the save and you're off, but apparently it corrupted the save so loading the last save brought me right back to the game frozen in the same spot thus requiring me to have to restart the system again and redo the entire level. *edit* Later on, there was a part after a cinematic where I came back in without the model for the primary weapon (think the finger weapon skins for Counter-Strike) and this section animations were becoming choppy.
Next, in a somewhat comical fashion, the AI seems to trip up over the geometry or just plain kills itself with explosives. I noticed that there weren't any aliens in the segment I was playing, but as I was stealthed and walking to the objective, a few of the enemy soldiers were getting killed. I even happend to see one guy look like he tripped over a street curb and died and another fall off an overpass.
