i saw the reviews and indeed they say the game is very short and you should beat it in 4 hrs. and they said the game is very easy on normal so if you've played fps before, you should play it in hard. so it's not that hard to believe someone finished it in 3 hrs.
I did it in like 4.5 hours on hard.
I enjoyed it, but its buggy. wasted probably half an hour on 2 parts where I couldnt get the script to activate.
when calling in the AC130 shots(fun) and waiting to take that little town at night near the beginning.
the guns fire way more realistically on single shot than auto. I also felt like the machine guns barely hit crap when firing remotely large bursts.
the pistols rock. I loved popping off 50 yard headshots with them.
by far one of my favorite levels(which took a few tries) is the last sequence in the first group of ranger missions. defending the hut till.