Elemental Weakness is working pretty good at the moment. I party alot with other players so I get to see the amount of damage done by certain spells. For example, R30ish party, Blind Efts are weak to Lighning. I've seen Water used, which does 250ish damage and usually procs with 0 dam,age. Aero does around 350. Lightning was doing around 450-550. We got a couple with buffs and Regimen to stack to 900-1400 each. So I'd say that the Elemental Attributes are working pretty good, but you won't see a huge difference on Solo play just spamming spells. You have to stack them with your buffs to see a huge increase, and make sure you are using the proper spell. You will see a damage increase using the right weakness and using a spell that the target is strong against you will notice it often comes up with 0 damage or miss.