The story takes you by the hand and leads you to each obvious objective then when that is completed you repeat and repeat again. Enemy AI is not that impressive, even on the harder skill levels. Most aliens are easy to dodge and strafing works best for taking down most group encounters. Your viewing angle seems to be severely limited in Enforcer. Your mouse moves the targeting crosshair but only slightly changes your view making it hard if not impossible to see above and below you.
Movement is rather strange.
While your mech looks like he weighs a ton he never seems to thump around like in other mech games. Perhaps it's the constant thrust from his jetpack that keeps him inches above the ground. He just seems to glide around even when jumping. The Unreal Tournament Engine has never looked better. The levels are cleverly designed and make use of excellent texture and lighting maps.