hear the howls and see the fast zombies jumping from roof to roof against you - pretty nervwrecking.For some reason, even though the gunship or the strider is probably a lot more dangerous than a fastzombie, those fleshed-out things scared me more than any other enemies. Perhaps it's because they just look crazy, and they jump all over the place. They also swarm in hordes, and that makes them very hard to shoot.
But I liked Unreal II more than NOLF 2. NOLF 2 just felt very repetitive after a while, and I gave up after running around in those Russian bunkers for so long.