You can play this class in two different ways, being the tanky class or the pure damage class. Warriors offer the most damage of all classes and has the best defense. Its main skill, power attack, offers up to x6.5 more damage making it very easy to one shot an enemy. The skill also takes up very little MP making it great for warriors with a lot of MP. For players that are wanting to play in a more relaxed manner and value damage < defense, the tanky path is a good choice. You will lose quite a bit of damage, but you still deal a good amount to grind efficiently. Without upgrading shield mastery, shields alone provide major bonuses to your defense. However, when upgraded, shields can increase your shield defense by an additional x1.7 more than before. For an enemy that you can already kill quickly, but you can not tank it very easily, this is where shields can come in handy.
Overall: A very good class. It is not the best choice for early game, but when you reach around late beholders+, the warrior can take off and become unstoppable. The main skills you should max first are critical damage, power attack, MP restoration, guild rage, and speed dash.( shield mastery if you will also use the tanky class ) The next set of things you should upgrade are quick avoidance, loot stealer, block, and jump height.
Just like the warrior, there are two different ways you can play this class. There is the most common far ranged class, and the close up class. For obvious reasons, the far ranged class will be mainly attacking from a far range. With the use of arrow barrage, arrow pierce, and triple arrow, this class can become pretty deadly. It does require slightly more MP than the warrior, but it can make great use of its MP. The second class you can choose is the close up class, and with this path the archer can be the best class there is. The only skill you need for this class is downward crush which allows the player to shoot out 4 arrows that do x1.9 more damage when maxed. As you can see, you will require a lot of defense and HP with range not needing to be so high. Down crush is about equaled to using arrow barrage twice, costs about x2 less MP, and can be used a lot faster. The only major problem this skill faces is being kill stealed by cowboys but when alone in a room or even in a room where enemies spawn in one spot, you can easily take control of the room by using this.
Overall: The archer is not the best class to go with early game. Every other class will easily surpass the archer until you can grind mags effectively. With the down crush skill, the archer can be seen as a slightly weaker warrior but with the ability to also play at a far ranged.
Will post other stuff later kek.