A brilliant combination of sandbox and science fiction games.

User Rating: 8.5 | Riot Act X360
The Good: Awesome graphics, frame rate never dips in single player campaign, guns and explosions sound great, thrilling battles with gang generals, awesome abilities improve as you play the game.

The Bad: driving is no fun until you have it maxed out, music in cars is terrible, no real "story" to speak of, tutorial voice never stops talking for the whole game. no features added into the co-op made.
THE WEAPONS AND "STORY"
In Cracdkown, your goal is to eliminate three gangs that have torn up three different cities. Each gang has seven different bosses and a final crime (a get together of all surviving gang members) that you must defeat before the gang is eliminated. To do the job of "cleaning up the city", you are provided with a huge arsenal of weapons and explosives (you may carry two weapons and eight of one type of explosive) that range from machine guns to sniper rifles to heat seeking grenade and rocket launchers.
THE ABILITIES
Agility
1 star-you can jump about 10 feet
2stars- you can jump about 15 feet
3 stars- you can jump about 25 feet
4 stars- you can jump about 35 feet
strength-you can heavier thing up until four stars when you are able to lift and throw trucks
firearms- you become more accurate with all bullet firing weapons, and they do more damage
explosives- your explosives become more powerful and get a larger blast radius
Driving- all cars you drive become faster and easier to handle and agency cars (3 cars given to you at your "base") develop abilities when you reach four stars.
THE GAMEPLAY
The gameplay is very good. you can do all the things that are possible in games like grand theft auto even though you are a cop. There is a small penalty when you kill a civilian. It is, in fact, so minuscule that i don't see why they even put it in the game. imagine this- you kill 100 gang members, then you kill 2000 civilians and your net gain is just about 0
CO-OP
The co-op version of the game is only available through xbox live. Although the co-op seems a bit half baked, it is pretty fun to play crackdown with someone on your friends list and then get to have it save onto your own hard drive.

All in all, this game is excellent and a must have for any 360 owners.