The Striker is a good, all around class. It is arguably the best choice for FFA/TDM gamemodes which are solely combat. The Striker has 4 health, medium speed and a 3-shot burst weapon.

Aiming:
If you have a good aim, using the Striker is fun and rewarding. Better aim will come with practice. If you aren't comfortable with the aiming yet, practice aiming on empty servers by shooting at shrubberies and destructable objects.

Movement:
Movement is one of the most important aspects of combat in Wild Warfare. If you stay on the move, you will be harder to hit with ranged weapons. "Bunny Hopping" (Jumping as fast as possible at all times) makes you hard to hit, but also makes it harder for you to aim at your target. To compensate for this, move your mouse downward as you jump to keep your crosshair steady. Practice this by jumping and keeping the center of your crosshair locked on a still target (a distant shrubbery or crate).

This image shows the first-person view of the Striker.

The Heavy is big, slow, and tough. The Heavy excels at mowing down threats from a distance and can soak up loads of damage before dying. The Heavy has double the health of the Striker and a full-auto minigun.

The Gun:
I debated on what to entitle this section. I decided not to call it aiming like I did with the Striker, because the Heavy has many more aspects of its minigun to worry about than just aiming. The projectile speed of the Heavy's bullets are the same as the Striker, so if you are used to the Striker's gun aiming the minigun will be easy to adapt to. However, the minigun is fully automatic, but overheats. To get maximum efficiency out of the minigun, wait until it is on the verge of overheating before waiting for it to cool down. If it overheats, you will have to do a good deal of waiting before you can fire it again. Because the Heavy's gun is very powerful, it is the best for taking out the Raptor (the giant mech on CTF_Gulch).

Where to start blasting:
Since the Heavy is slow, it doesn't matter as much as to how you move, but where move to. Pick a spot where you have a good, clear view of the battlefield but is away from most of the action. Then you can start mowing down the enemy! If you do get caught in a close-quarters situation with the Heavy, this is where it pays to have good aim. Keep your crosshair locked on to your target an move around as much as possible (its slow, but every little bit counts! Bunny Hopping with the Heavy while firing is impossible). Remember: the Heavy can take alot of damage, but don't rely on this too much and end up waltzing right into enemy bullets.

This image shows a first-person view of the Heavy.

The Engineer is light and fast. Its only weapon: a pipe wrench. Even though it only has 3 health, the Engineer is great at dodging bullets.

The Pipe Wrench:
The Engineer is currently the only class that has a melee weapon (its only weapon, actually). Although limited, the Engineer's weapon deals two damage per hit, able to kill a Heavy in 4 hits or a Striker in two hits. Use this to your advantage.

Movement:
Movement is going to be your main asset when using the Engineer. It can double jump and hide up high in the most inconspicuous place and then drop down to ambush its enemies. The Engineer can also be used to jump over and behind its adversary during combat, making it very hard to keep in your enemy's crosshairs. Bunny Hopping with the double jump feature can prove the Engineer very hard to hit with ranged weapons.

A view of the Engineer in First Person: