when I first started playing DQ, I used Rogue, but when I started playing with other classes, Wizard went to the top for me, and Warrior was a loser in my eyes. the thing about Wizard, just point and shoot, with lots of OP Skills that do lots of damage in AoE. plus Wizard has lots of Talents in Elementalist Talent Tree to boost Fire/Poison Elements DoT, Element Crit, and increase AoE of AoE Skills. Wizards are good at keeping distance and blasting targets, Warriors are good at getting in a targets face and being the last thing the target sees, and Rogues are good at causing lots of damage at a distance or up close. another thing is, as you level up your Characters, Talents, Skills, and Affixes get more powerful, so you end up with builds that can make any class awesome.
the cool thing with Storm, it lasts 5 seconds, attacking anything in it's AoE for 600% MH damage every .25 seconds! it has a knock back effect, so it is knocking targets out of it's AoE, but if you can freeze, taunt, or stun them, they stay in the AoE. and with the right Talents or Affixes, you can increase the range of Storms AoE to get more targets, and anything that rushes you ends up in the Storm. the only really down side to Storm is it doesn't stack like a lot of other Skills do, and it doesn't move from where it originally was cast. I don't know if Storm Skill and Storm Proc stack, or if 1 overwrites the other.
I have been playing for awhile now, and I don't think Warriors are a loser class anymore. getting beat up in the Arena a few times by Warriors has helped to change my mind. I have come to discover that I just need to make a Build with the different classes that fits my play style, and good times will come my way in DQ.