Her strongest skill is Black Shield anyway. Not saying she's bad, just a different type of AP char.
Orianna's early game has been nerfed, we don't know how that's going to affect her yet. Her harass capability has gone down a lot with the range/mana nerf on Attack. I'm reserving judgment for now.
Malz and Anivia are very good if played well. Malz is admittedly better in certain circumstances, Anivia can't do jackshit without her team.