I've an Elementalist (Power 2631, Thoughness 1484, Vitaly 1484, Health 16.485).
Tried to run the Eye of the Brand Storm. Terrible, bosses drove me crazy, every 20-30 second dead and/or retry at a starting point.
I've a Ranger too (Power 2238, Thoughness 1000, Vitaly 1000, Health 15.922).
First run: never died, never retry at starting point. Just fun.
The lesser mobs didn't do much harm, got the idea my NPC friends helpt me more and faster to survive.
The Elementalist (she uses fire only) has some ascended gear, has higher stats, still she's weak.
I didn't even try the full berserker gear set.
The "weak" ranger, with mediocre gear is strong.
P.S. I'm just a leisure PvE player with little knowledge.