...There is a lot of fun to be had by mixing the different packs with the various weapons. At one point I was holding a sniper rifle looking for a vantage point. As I ran over a bridge, dodging rockets and holding my breath, I came across some jet packs. The smile on my face could only be measured in metres, and I looked up high to pick a spot from where I would drop .50 cal lead on helpless opponents down below. Hitting the left shoulder button and taking off, still smiling like a kid with a new toy, I reached my chosen spot on top of a tower and got to work on picking off the unsuspecting foes.
After a few shots and still retaining my ear to ear smile, I spot a guy respawn and head my way. A flash and a trail of smoke, then there was a rocket the size of my arm heading in my direction. I was quick to engage the jetpack’s thrusters and take off high above the impact point, looking down on the explosion and watching the very tower I was stood on collapse before my eyes. Still smiling, it is moments like this that make this game so much fun. The tactical opportunities seem endless; Go on a rampage with a sledgehammer and the Rhino pack. Drop mines from high above using the jetpack. Run into a crowd of enemies and launch them into orbit with the concussion pack. Or stay cloaked and drop opponents from a far with the stealth pack. Magic....
http://www.thesixthaxis.com/2009/05/13/red-faction-guerilla-hands-on/