I think some sets have the wrong stats on them or are just plain unbalanced and need a change the first of which I will freely admit is for my own class the savage secmathian set has int on it and I would argue that int is useless to the class and should be changed to agi (and perhaps lowered to balance)
Reasons that int is mostly useless to this class:
1. we get a good amount of MP anyway
2. most of our skills just had the mp cost lowered meaning we need int even less

http://postimage.org/image/2bkf61co4/
Most of our sets have agi on them and considering this the int is just plain out of place and should be swapped for agi
Another set there is a problem with is the paladin set with crit. damage as the 3 part equip effect (sorry don't have a picture of it) it allows a paladin to stack a lot more CD than should really be allowed.
These are just my opinions I want to see what other people think and please bring up any sets you think are unbalanced too.