I have been Arcane for some time now and have tried the spec since the patch came in.
At level 85, it is really way behind Fire and Frost. Even with the right rotation, the spells feels like they are not doing enough damage. Will have to go Fire for now and see if Arcane is worth adopting at level 90.
But I have a feeling I will stay Fire and a lot of people will do so. Blizzard seem to have killed the Arcane spec, at least for now.
I have to agree with this. It doesn't feel like you're doing enough damage. If you have enough time to ramp up it does. That feels like it takes to long.