There are certains classes which are nearly needed to have a reasonable experience in GW 2, them being Guardians*, Mesmers** and Warriors***.
It’s basically GW 2’s Trinity.
Support*, Utility**, Damage***.
While other classes can fill certain roles as well, they are just by far not as good as them.
Support:
The Guardian with his sheer amount of group support and control, that may be to much to even list up.
A Healing Power Necromancer with Staff and Wells can be an amazing support, but after all, he can’t keep up with all the Utility and Boons the Guardian has to offer.
Elementalist has great potential for healing and buffing, but over all comes short in terms of (group) survive ability and can’t compete with the shiny Guardian running ahead, smacking people in the ground while keeping his whole party alive, CC immune and stacked up with dmg buffs.
Engineer has a bit of everything. Average defense, average boon control, average healing, average utility.
But as Guardians are amazing in every of these aspects, why would you not take them instead?
Utility:
There is nothing that can compete with a Mesmer for Utility in the game. Miles behind (so far you might not even mention it) may be a Thief with some short group stealths and the Engineer with his (often more random than good) general utility.
But why take a Thief or Engineer when you can stealth, speed buff, teleport and haste your whole group as Mesmer?
Right, there is no reason.
Damage:
This one clearly goes to the Warrior.
The sheer amount of DPS, while still having a metric ton of health and armor, combined with easy access to some group utility leaves every competitor behind.
Rangers by far can’t keep up in DPS with a Warrior, while also not catching up with Support or Control. Besides that, they end up with lower base armor and health, making them more squishy while not making up for it.
Thieves may have some of the greatest burst (but Warrior burst is still much higher), but by no means can their dps come even close to a Warrior.
While they have some nice gimmicks like stealth, the group Mesmer fills that role already better, and in no universe they can make up for the lack of dmg, the incredible low base health, and medium armor a Thief has compared to a Warrior.
We already had a Engineer here and there, but the picture here is still the same.
He may be a good class to fill spots if you can’t find multiple Warrs/Guardians, but by no means can’t replace them in any GW 2 Trinity profession.
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Tier 1 ( nearly mandatory for reasonable gameplay)
Mesmer (Utility), Guardian (Support), Warrior (Damage)
Tier 2 (can fill spots if you can’t find multiple T1 professions, but not replace them to the fullest potential)
Necromancer (Support), Engineer (Support; Utility), Elemantalist (Support)
Tier 3 (near useless, with low potential for a near mandatory role in the game)
Thief (-), Ranger (-)
(These Tiers, and the post as a whole, focuses on PvE and to some extend WvW and are not concerning sPvP. This is not representative of my opinion of the game and mere a potential subject of discussion.)
(edited by Asum.4960)