hunh, are you folks playing the same game I am?
I was fortunate enough not to have any technical problems, and I have a fair ammount of CPU and ram to throw at it.
The AI was pretty good, but I could imagine it sucking if it had less CPU time to spend on it. THe AI is a nice design, but it clearly makes decisions at intervals, and if heavy CPU usage pushes those intervals farther apart, that would be bad. They are on par with the behavior of half-life marines, but they behave that way without scripts like half-life used. Which is a pretty good acheivement.
Visually it si nice, but there have been a lot of people having video problems with it especially with anti-aliasing. I was able to run it at 1024x768x32 with anti-aliasing set to medium, and it worked nicely. Very smooth for me.
Polish wise, it needs to get rid of the pondering reality with a black screen when making config changes or progressing through menus. It needs to work on the LOD popping as well, and they need to adjust the minimum and recommended stats. having a lot of ram apparantly makes a large difference in how the game behaves for you.