Returning player seeking help.
Guardian has lots of skills to reduce, and even negate damages totally. This makes them tougher to kill than Warriors, despite their inferior HP pool. Very often my Guardian is the last one standing while my party of warriors get wiped one by one in a bad dungeon run. Less DPS than a warrior, but much tougher and can provide great support to allies via boons and other skills. Fine-tuning stats allows you to spec your Guardian to be more aggressive if you want ( in exchange for less durability). However with very limited speed buff, range skills and the nature of their other core skills, Guardian is not your roaming type.