By and large TV mini-series are horrible little things, plagued by low production values and actors that barely qualify as B-list. Occasionally you see a Stephen King story pop up that is told fairly well, but other than that the field is sparse with anything of decent quality. Because of this, the Kill Zone deserves special attention for what it is - an extremely well produced piece of television that falls more in line with a moderately low budget movie than the typical TV mini-series you run into.
The acting is top notch, Leguizamo and Wahlberg(who looks exactly like Bruce Willis circa 1990 oddly) deliver performances worthy of any film and the rest of the cast who are primarily unknowns(except for an appearance by Wahlberg's Saw 2 nemesis, Jigsaw himself, Tobin Bell) all fill their purpose more than adequately.
Unfortunately it does has its share of flaws, otherwise it wouldn't be stuck on a mediocre cable network as a mini series to begin with. Primarily there are a number of plot holes and quite a few issues of improbable occurrences(a massive fire fight between two heavily armed forces that results in the casualty of not one character central to the story for example), so basically the stuff you can typically lay at the foot of any action oriented movie, series, or other.
The basic story however is quite solid, and has multiple layers presented to keep it from just being some guys holding hostages in a bank for 8 hours straight. While some of these lines are never taken to their true potential(primarily Tobin Bell's involvement) in favor of keeping the focus on Leguizamo and Wahlberg's interaction, for the most part they serve their purpose.
All in all, you have to look at this series for what it is. A mini-series on Spike with a moderate budget at best. And for what it has going for it, it is damn good and a solid 8 hours of entertainment. And really, what more can we ask from our TVs? Not everything need be a masterpiece.
