Have you got past the bit where you play Lucas as a child and have to sneak into the Army base?
I have. It's quite tricky and made tougher thanks to some awful colour choices on the minimap.
I found that a litle annoying too, but got it eventually. I got stuck and gave up at the rooftop fight/escape, where (basically) you needed to pound the trigger buttons really fast or you died. You didn't get enought time to get up to full speed and having to play through the preceding section again and again eventually got too much for me.
It got traded in, unfinished. A shame really because there was some interesting stuff in there.