http://guildwars.wikia.com/wiki/Effective_ranger_guide
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A Ranger’s Place
“Sometimes armed with a bow, sometimes with a hammer, sometimes with a staff, another weapon or even their pet, Rangers have a number of useful roles, including setting traps to defend a location, using their multitude of interrupts to keep a caster under pressure, or simply piling on the damage with their high powered bow combined with preparations and Nature Rituals.
Having extraordinary elemental protection in their armor and equipped with a number of stances, many choose to join the melee either with a weapon or with touch-based skills. Ranger animal companions are often brought as another body for blocking. Some rangers forsake damage with a bow and preparations to focus on their pet entirely with pet attacks and calls. These ‘proper beastmasters’ are rare however".
Being a Ranger
“Due to their distance attacks, fairly good armor, and variety of defensive stances, rangers have a relatively high survivability in battle. Meanwhile, they can be focused to shut down a target or to spread their damage out.
A focused build either has high-powered attacks coupled with preparations and enchantments to further increase the damage or interrupts to keep their target helpless. As arrows can be dodged, snares are extremely useful to keep arrows from straying as are skills that decrease arrow flight time.
Snares can be used defensively as well to kite an opponent. This works especially well against warriors who may chase uselessly after you while you pelt them with arrows if they have no way of removing the snare. High-powered rangers often will team up with each other and focus attacks in order to create a damage spike.
On the other hand, a ranger may choose to spread the damage. Barrage or Incendiary Arrows are powerful tools at accomplishing this, and they may be very useful against clumps of mobs in PvE as well as taking out clumps of minions or ritualist’s Binding Rituals. In the Jade Quarry mission, a single Barrage ranger can often take out entire quarries and guard posts if positioned correctly.
Another way to spread the damage is by spamming conditions. Using preparations such as Apply Poison or Melandru’s Arrows or by using a fast recharging attack such as Poison Arrow or Crippling Shot, the ranger can cycle through targets, taking one shot at each before moving onto the next. However, if spamming conditions, beware of monks using skill such as Martyr that can quickly render the technique useless.
Occasionally, a ranger will focus on strengthening his or her pet. Pets can perform just about any task the ranger can do, but in melee form. However, the pet does follow an AI algorithm, and thus timing skills or coordinating targets can be more difficult than if done with the bow equivalent. Also, by placing points into Beast Mastery, the ranger often must sacrifice either its own offense (in the way of Marksmanship) or defense (Expertise stances or Wilderness Survival healing).
The advantages of bringing a pet is that they provide another attacking body for free, they can body block while allowing the ranger to stay at range, they are often ignored in PvP and thus can often catch a caster off guard, and they can be buffed to be extremely durable. At 16 Beast Mastery also, pet attacks can deal damage that can match, even exceed with some pet attacks, the damage of a warrior.
In many zones, trappers are in demand. Traps are unique to the ranger and mostly occupy the Wilderness Survival attribute. Each trap causes some condition and usually some damage to any hapless foe that walks over them. Traps can be stacked, allowing their usually small damage to be compounded and multiple conditions to be inflicted simultaneously.
(edited by Burnfall.9573)