more usefull profession
Warrior – CC, AoE Cleave Damage, AoE Healing, Condition Removal, Fury, Vigor, Swiftness, Might, Banners/Group Blasts
Guardian – Walls, AoE Protection, Stability, Might/Healing, Aegis, Altruistic Healing (hard to be killed) and Hammer blast is very good
Mesmer – Glamour build (Confusion bubbles of death), Time Warp, Portals, Boon Removal, Condition Removal, Veil
Necromancer – Boon Removal, Epidemic (ugh), Wells, Marks (terrain denial), Fear, AoE damage, Condition Removal
Elementalist – Fire fields, Water fields, Static Fields, AoE CC, Boon sharing, Aura Sharing, Siege killing
I could post about some other classes but I’d might miss some things or specific nuances.
If you’re already a Thief, you aren’t the best group support but you can spec yourself in P/V/T gear and build around constantly blinding everything you’re fighting. Nothing a Hammer Warrior hates more than being blinded.