It wont be broken at all. S tier classes like warr, ret, dh, rogue and lock will still be much better than MM rework. And dont let me mention frost mage its a god spec that makes the life of all melees miserable, then they come here and cry because they cant compete with MM. I have zero symphaty for them.
All of those I listed will still be far more superior than MM in next expansion. MM will still have the same issues, more precisely defensive wise and mobility wise. Its not cool to have 1 disengage while melees have 5 gap closers and mages 10 blinks. They all have self heals which hunter lacks. They have great mobility while hunter have a depressing disengage with only 1 charge. They have absorbs and utility which hunter also lacks. So how can you say this stuff?
We all know MM is in a very bad state. The rework will just help the spec and uplift it to a normal state as it should be to compete with other specs which at the moment it cant.
I know the rework may sound broken for you but it wont. It feels its broken because MM has been bad for a long time thats why it feels broken because your not used to have the same powers as other specs and thus you believe it will be powerful. It wont. It will be completely normal and finally MM can compete with other classes.
Imagine if you were on a wheelchair for nearly decade and suddenly you can walk again? Yes of course you will be shocked and feel ‘broken’ and powerful but reality is its completely normal to walk like other people.
The same rule applies to MM.