Marvelous Marauders!

Marauders have to be one of my favorite units in the game. They are fun to play, and useful when it comes to playing against anything with shields and armor. The marauder is mainly a support unit; and a staple in early-game play. They come with a 2 supply, 100 mineral cost and 25 Vespine Gas cost to build each unit.

PROS:
They are effective against armored units, like the roach and stalkers. Marauders are also effective against Siege Tanks, Immortals and Thors as well, but to a lesser extent. They can take down and destroy buildings quickly and effectively. When combined with the MMM build (Marines, Marauders, and Medivacs) They can be very deadly. They also can go inside Bunkers for protection and Range increase.

CONS:
Some downsides to the marauders are the fact that they are vulnerable to Zealots, Marines and Zerglings. They are also terrible against Banelings. All Air units counter Marauders.

Abilities
Concussive Shells   
Marauder attacks slow the movement speed of non-massive enemy units by 50% And it only effects one unit at a time. This is researched at the Barracks. This normally is the first upgrade I choose to research when I am against a Protoss. The slows are capable of having a crippling effect on stalkers and those pesky Zealots.

Stim Pack     
Increases attack speed and movement speed by 50%. This is crucial to have if you want to pack an extra punch to your attack.

Upgrades
Upgrades you might want to grab are the Infantry Weapons and Armor, that is researched at the Engineering bay. These aren’t only just helpful for your Marauders, they actually help out all of your ground units Armor and Weapons.

Game-play Tips and Countermeasures
One rule to play by while using Marauders, is while against a Zerg, you should build fewer Marauders as usual, (unless you have scouted Roaches) and more then usual against a Protoss.

Terran VS Marauders: You should focus fire with Marines and Marauders. Medivac and Stim helps out tremendously. Build a few tanks and research Seige mode. And since Marauders can't attack air targets, Get Banshees.

Zerg VS Marauders: Research Metabolic boost and surround Marauders with a large group of Zerglings. Also combine your usage of Zerglings with Hydralisks or Mutalisks. Burrow also helps to ambush enemy forces that are on the move towards you.

Protoss VS Marauders: Attack Marauders with a large group of Zealots. Charge is necessary. Sentries are vital in protecting your army from the blows of the Marauders. Use forcefields to keep them away. With Immortals, you can focus fire and easily shrink down the size of the Marauder army. And since Marauders cant attack air units, Void Rays work very well.

Remember, Everyone has their own favorite units and tactics in gameplay. This is what makes the game so fun and exciting! I hope you can take my tips and include them in your own gameplay and reap the benefits! GLHF!