One of the most unique games ever; also has a ridiculously steep learning curve.
I've been playing this game for over three years now, on and off. Simply put, once you get past the steep learning curve in the beginning, it just gets better and better.
GunZ is a game based solely on skill. When you start out, you will get destroyed. After playing for hundreds, or in my case thousands of hours, the game is entirely different.
GunZ has been classified in the category of "Emergent Gameplay," which means that it is constantly changing and evolving. Originally, it was simply a poorly made third-person shooter back in June 2003, which is apparently what most people still see it as now. Sure, wall running and tumbling sounded interesting, but it doesn't add that much to a shooter.
With the discovery of glitches, however, the basic controls have evolved into a series of moves called collectively as "K-style." This is what makes GunZ so unique. Through a series of animation canceling, (as in SSBM wave-dashing and L-canceling, BXR in Halo 2, etc.) quick and complex moves can be performed, such as swinging with a sword, shooting two guns, and dashing in two different directions, all while in the air from a normal jump.
If one takes the time to learn how to play the game, (with a teacher in a best-case scenario, as it is so difficult to grasp alone) he or she can be in for years of enjoyment. Despite the most terrible and cruel online community known to man (which I believe is due to the game being based almost solely on skill), there are still some nice people around willing to help and befriend you.
I've logged on Xfire (and I don't leave it on all the time, and only started using it several months into the game) over 1,500 hours on this game alone. 1,500 hours. I'm surprised, actually, that this game hasn't hit any MLG competitions, as it would be the perfect game for professional gaming; you can always improve, since new moves are always being discovered.
Anyway, I highly doubt any of you have read this whole thing through, but just keep in mind that most of the other reviews you see about this game involve people who have played less than 10 hours of the game, and have seen less than 1% of what this game has to offer. And watching the "Cheaper by the Dozen" video just demeans this game; all those players are "ez noobs" by any GunZ player's estimation.