Rewoked Rek'sai feels awful to play right now :(
You are now basically forced to build damage on her since all of her scalings are BONUS AD,if you however build damage on her you are squishy as hell and when i say that i mean reeeeally squishy as hell. Literally in order to do any damage you need to build damage but in teamfights you have no way of getting out and you die in matter of seconds.
If you decide to build her tanky ,you deal absolutely zero damage and pre rework Rek'sai was at least 3 times better tank due to unburrow being able to knock up up to 5 people in teamfights and she had better base damage as well as global ultimate for control.
Now she has ultimate that scales with BONUS AD and can be dodged so easy ,later in game if you ult into enemy team might as well just get reported for inting since you will die before you land. I dont really get the point of what am i supposed to do with her after laning phase is over and people start to group, there must be something i am missing.