Brute Shot
Magazine Size: 6
Dual-Wieldable: No
Underpowered in Halo 2, the Brute Shot's magazine has been upgraded to hold six 'nades at a time. This easy to use grenade launcher's newly enhanced accuracy makes it a sturdy anti-vehicle weapon, and the grenades don't bounce off surfaces anymore. The melee attack with the Brute Shot is also extremely lethal as it has a spear attached to it, which can be used to bludgeon an enemy. Bear in mind that even though you can't zoom or dual wield with this weapon, its precision and power are a combination that can explode the life out of even the most hardened Halo veteran.
Pros: It spits out grenades much faster than your average grenade launcher and it still inflicts a lot of damage just like your average grenade launcher. During Halo 3 campaign, the Brute Shot is easily attainable because you'll always be running into Brutes carrying these things around. The weapon is effective in taking down larger enemies and if you don't quite kill a target, the blade attached to the Brute Shot which increases its melee power will come in handy when you bash them with it.
Cons: The Brute Shot is not nearly as devastating as other guns in the game that fire explosive projectiles, such as the Rocket Launcher, Missile Pod, etc. Its clip is also relatively modest so the second weapon you have equipped needs to be more balanced, meaning you need something that holds more ammunition so you don't run out of bullets while in the middle of a fight.
Gravity Hammer
Magazine Size: 100
Dual-Wieldable: No
Thor himself would shat his loin cloth if he ran into someone wielding one of these behemothic Brute hammers. Similar to the Energy Sword, the Gravity Hammer is a two-handed weapon that you can use to strike down your enemies with ease. For maximum results, sneak up on an unsuspecting enemy, bust out the G-Hammer, and then deliver a concentrated blow to your target.
Pros: Swinging this giant hammer into an enemy will almost guarantee their demise. Once you experience the destruction this weapon is capable of, you'll know why only Spartans and Brutes can hold these heavy bats up and use it to smash their attackers. Taking the Gravity Hammer into battle allows you to crush multiple enemies with a single blow. Also, if an enemy is out of range, the shockwave created by the weapon will push them away from you.
Cons: The Hammer is not a practical weapon to use when fighting against a large group of enemies because its size and weight causes it to take a long time just to swing the damn thing once. The Gravity Hammer's range is also extremely limited.
Mauler
Magazine Size: 5
Dual-Wieldable: Yes
The Mauler is the Brute equivalent to the shotgun, and while its size is modest, it does pack a killer punch just like the UNSC boomstick. Even though it only holds 5 bullets, you can have one of these in each hand which makes the Mauler a great deal more devastating.
Pros: Maulers are a faster to way to destroy your foes than your default weapon (the Assault Rifle) as well as many other weapons available in Halo 3. The Mauler is an effective way to blow the brains out of your enemies in a hurry.
Cons: They have a slow rate of fire, and, being a close relative to the human shotgun, the Mauler's range is limited and you won't be able to hit targets that are more than a few feet in front of you. Although you can and will find them, Maulers are also somewhat scarce during the Halo 3 campaign.
Spike Grenades
Magazine Size: N/A - (You can hold 2 of each type of grenade at once)
Dual-Wieldable: No
Giving new meaning to "sticking it to someone," the Brute Spike Grenade looks like a cross between a medieval mace and a Stielhandgranate, but is actually the perfect tool for attaining instant kills. Chucking one of these spiked bombs at an enemy with enough precision will cause it to stick to their body. After this happens, all you have to do is watch as the Spike Grenade's detonation destroys them, but don't stand too close or you'll end up getting marred in the process. Successfully doing this takes a steady hand and good aim, and if you can't manage to pelt others with it, sticking it to a surface can still hurt them if they are within the blast radius.
Pros: If an enemy gets close enough to cave their face in with the butt of your gun, you can always eliminate the risk of them killing you first with a melee attack by stapling a Spike Grenade to their flesh.
Cons: If your aiming is crappy, then these spiked Brute bombs are essentially useless to you and you're better off using Frag Grenades.
Spiker
Magazine Size: 48
Dual-Wieldable: Yes
The Spiker fires superheated projectiles that literally sink right through energy shields, your foes, and just about anything else you point it at. Pick up two of these bad boys at once to really eat up your enemies with the Spiker. Keep in mind that the damage you can inflict with this gun is somewhat limited and you need to spray enemies with lots of its ammo to get them to croak.
Pros: If you don't miss, unloading the Spiker's projectiles on an enemy will quickly deplete their health. The clip is relatively big, giving you a considerable amount of time to make your target(s) dead before having to reload.
Cons: Although the Spiker is powerful, it is certainly not the most powerful weapon available in the game, and for certain battles it's not your best option if you can get to other deadlier weapons.