The Evoker holds nothing back, turning even their bodies into dangerous weapons capable of reducing buildings to rubble. Unmatched in sheer magical power, an Evoker is an existence to be feared.
Arcane Tattoo will reduce the first equipped Mage/Evoker spell by 25% if you're wearing light armor, or 40% if you're wearing unarmored. Meaning that if you want to take advantage of this passive, you would have to forego heavy armor entirely.
No physical damage capability without a secondary class, making enemies with high RES or spell-reflection abilities a real problem.
Silence makes you useless if you don't have an option to counter it.
FP costs. You're gonna be struggling in that department.