It's always a blast to kill zombies alone or with a friend.
You start off with an assault rifle with unlimited ammo and a special laser-sight technique that charges your shot into an even more powerful shot that can tear through hordes of zombies like a hot knife through butter. As you kill zombies or open containers/car trunks throughout the stages, you earn points, a multiplier that increases your score and money. Successfully completing a section of the level where a shop is stationed will give you access to more weapons like a submachine gun, shotgun or even crazier weapons like flamethrowers, grenade launchers and a gun that fires blades at insane speeds. Add a few Molotov cocktails, grenades, mines and dynamite into the mix and we got ourselves a party. Also you can upgrade your arsenal to give it a little more of a kick with every bullet shot or every explosive device thrown.
However, going into the game with guns blazing and being completely reckless will only get you killed a lot faster, so it's best to be sure what kind of armor you intend on wearing to protect yourself. Armor is broken down into three categories: upper torso, arms and shin guards. Each piece you collect throughout the game's campaign has an everlasting effect on the way your character moves, how much damage they can take or how much endurance the armor will have before zombies rip you a new one. So it's best to be more strategic with your defense as well as your offense.
Each zombie you encounter WILL be different from the others every time. There's the weak zombies that go down with one shot. There's the fat zombies that will charge you when you shoot them. There's the firefighting and military zombies that move a lot faster than the firefighters when shot at.....and did I mention that they're packing heat too? No? But nothing compares to the 'elite' zombies (or more better known as mutants) that can become a pain in the ass if they are not dealt with in time. We got FATTER mutants that will rush you upon and try to explode all over you. Smaller creatures that spit acid, brutes that use their super strength to pummel its enemies and quite frankly the worst of them all, a 'screamer' that summons a HORDE of zombies to bomb rush you every time it opens its mouth. Kill.....them.....upon.....SIGHT.
Environmental wise, it's everything you would expect from a zombie-apocalypse. Cars thrown around the stage (that can be used as a distraction for zombies if it has a car alarm), thousands of dead bodies scattered across the roads, buildings destroyed and toppled over. The only sound you can really hear are the sounds of zombies (especially when you can't see them.....yet), your footsteps as you go through the now dead streets and the eerie music at times as you survive.
Dead Nation is a usually good game, though if you are playing by yourself, there is really no need to play again unless you want to beat your old score or try out the more harder difficulties. But with a friend (especially if it's local), Dead Nation is a blast.