snap crackle pop rice crispies.
If you're a single player, the campaign is very good. It's about World War III, and you play many soldiers helping troops, riding helicopters, and answering to the call of duty. In the end, you kill a long rival from Modern Warfare I® that's been causing you a lot of trouble.
If you think single player is good, multiplayer is rocking it out. There are many more and better assault rifles, sub machine guns, light machine guns, shotguns, sniper rifles, machine pistols, pistols, and launchers. There is also more equipment, such as advanced grenades and deployable but destroyable equipment such as motion sensed explosives to portable radars. There are even new and better kill streaks, ranging from perks to death continued awards. There is also an all out survival mode.
Like I said, there are bad things and people. There are some people who live alone without a job that play 24/7 and hackers or modifications, but most people play fair. There are some hackers, but not much. There will be more as the game becomes older because hackers will find ways to penetrate the line of sight. Eventually, they all get kicked out, though.
Despite many bad things, overall, MW3 my game of the century.