Yeah, that would be pretty cool indeed. They could also add a couple of warrior only physical hit animations. For example: When you hamstring you make a downwards slicing/chopping/bashing animation that makes those floor cracks like thunderclap does (but without thunder obviously). The bleeds could be made more visual but I'm assuming Blizzard doesn't want to do something like that because of the game being Teen rated. Some sound effects would be cool aswell, an actual badass shout like the Vrykul used whenever we shout rather then the grunt/moan most races seems to make right now.
It's hard to give warriors visual improvements since all they really do is swing their weapons around.
Although the animation from blackout kick could be used for mortal strike and raging blow for example. But red instead of black and coming from your weapon and not your feet ofcourse. Giving pummel a crazy punching animation (PAOW RIGHT IN THE KISSER) would be sweet aswell, don't really know what it currently does tbh. Some cool animation when charging would be nice, like rocks flying away in your path because of the sheer force behind that charge or something.