I'd love to have seen what GameSpot would recommend in terms of multiplayer strategy, but I doubt that three months later it's ever going to be posted. :/
Your wish is granted. Our Twisted Metal Walkthrough provides tips for the 18 chapter storyline, tactics for online play, and means for gaining every unlockable.
Walkthrough: Mr. Grimm
Dual Juggernauts DM - Diesel City
Unlocks: Meat Wagon
This stage is similar to Sweet Tooth's battle with a lone Juggernaut, only time there are two. These Juggs have some extra firepower in the form of a mounted turret, which can hit you from all sides. One thing to remember is that despite there being two of these enemies there is just one spawn timer, meaning that only one enemy will appear every 90 seconds.
As with the previous Juggernaut battle Outlaw is one of the best choices due to its defense and great honing turret special. This time around also consider bringing in Talon. The helicopter is fragile and takes some time to get used to flying it. However, the pay off is one of the strongest special abilities with its first person machine gun turret. This special is powerful enough to destroy a single Juggernaut without much trouble. Just make sure to wait until one of the Juggernauts is by themselves as the other enemies can still aim upward and damage your chopper.
Take out each Juggernaut with a Talon (or two if you take too much damage), quickly get to the garage and switch over to Outlaw. Now its once again just a matter of clean up. The standard tactics apply of destroying low defense enemies first and depriving the AI of good weapons and healing.
Small Area DM Battle - Grindhouse
You'll want to make use of two vehicles here: first Outlaw and later Kamikaze. Road Boat or Sweet Tooth are also decent choices for your third. You'll be fighting in very close quarters for the majority of the match, making it useful to deploy close weapons such as the shotgun or constantly lay down mines.
There is a single garage right outside the movie theater, giving you a huge advantage over the other enemies. Since this is a very small arena keep an eye on the Health Semi driving around the perimeter, as runaway enemies can easily use it to restore all of their life.
The overall strategy is to get into the middle of the brawl right away, put up shields and unload on as many weak foes as you can. When it comes down to just 2 or 3 enemies switch up tactics and trade in the Outlaw for the Kamikaze. This will allow you to hunt down the remaining enemies that might try to retreat or hide inside the cinema.
Electric Cage - Thrills and Spills Park
Unlocks: Absorption Shield Ability
This is a Electric Cage match with the same rules as last time. The Park is much more tricky to navigate than the previous city so one is tactic is to rely on Talon to simply fly over the obstacles. However, we personally stuck with Meat Wagon for its durability, average speed and most importantly powerful Gurney Bomb.
Overall this match isn't very challenge as long as you can maintain your grace period long enough to take on at least half the enemies. A good tactic is to attack the enemy as they head to the next cage as the typically won't bother to counter-attack during this time.
Endurance Battle - Watkyn's Harbor
Unlocks: Shotgun Sidearm
It's time for a new match type in the form of Endurance Battle. All of the enemies are against you and when you destroy one, another will quickly spawn. On the plus side you only need to take out eight total foes to complete the round.
As with most matches we recommend either the Outlaw or Meat Wagon to outlast the enemy and pack a powerful punch. The main thing is to go after the weakest enemy, particularly those that are traveling on their own. Reaper is easily the key target in this match, but other speedsters like Crimson Fury and Kamikaze are great targets to clear the map quickly.
A Race to Battle - Sunsprings, CA
Unlocks: Super Mine Ability
Oh boy, another race. The rules have changed for this match. You don't need to make first, simply get into the top four to survive. The biggest annoyance in this battle is the low number of gates you can skip before dying: a mere 12. You'll need to be both quick and careful if you want to make it to the end.
Once again stick with Kamikaze for its speed and freezing special. While Crimson Fury might out right lap you, you can still pick off a few other weak speedsters such as Reaper and Roadkill. However, the biggest problem is blindly racing on a brand new course. Don't feel discouraged if you have to restart due to a crash or missing too many gates.
The track is tricky but you can get a hint of where to turn by paying attention to the arrows on each gate. They will always point you to the next destination, even if you only have half a second to process the information.
Iron Maiden Battle - Dead Man's Crossing
Now here's where things get absurd. This is yet another boss battle which means all the normal Twisted Metal conventions can be thrown out the window. First, pick a vehicle that has decent defense, speed and has a special that doesn't travel over land. Outlaw is still among the best choices, but Roadkill and Death Warrant are also manageable.
It isn't mentioned in the game itself, but your first objective is to destroy the red limos and capture the leader that falls on the ground. Drag her over to the parked sacrificer and put up your shields. After the meter charges up you'll blast off a rocket which you must pilot into Iron Maiden. However, Dollface can destroy your missile with her own attacks. You'll need to steer passed the enemy projectiles and accelerate into the monster sided robot.
After hitting her once, you'll need to repeat the process of capturing a leader from a red limo and firing a second missile. This time around the sacrificer will be constantly moving, meaning you'll need to follow behind it to deploy your rocket.
Once you've hit Iron Maiden with two missiles the shields will be down, so pelt it with everything you've got. Specials, homing missiles, bombs, even your basic guns. Once the machine is down to 50% health Dollface will release an Electric Cage.
During this time you only have 40 seconds of Grace Period to stay inside the cage and if you run out you will instantly die. The cage will constantly move with Iron Maiden, meaning that you will need to constantly drive and shoot. On the plus side you only need to deal another 25% damage and will restore to full health at the last check point if you do die.
At the last 25% Dollface will crash the Iron Maiden into the bridge. Use every weapon you have to finish her off once and for all. Just behind you is a Power Missile and Health Pack which will be extremely useful for such a fight. You can also prevent a majority of the on coming damage by jumping over the shockwave attack Iron Maiden uses every few seconds.
The match isn't over yet. Drive forward across the rest of the bridge to heal up and grab more weapons. Dollface will reappear in Iron Maiden's head. It's now a simple matter of unloading all of your firepower. Don't worry, the head is much more flimsy than the whole machine.