Sub doesn't need patchwerk. Sub works just fine mechanics wise on the vast majority of t14 fights (numbers were just a bit low). Sub just can't have fights where you can't use its primary abilities when you need to. They either need to fix this positional crap, at least to the degree of a feral, and/or (preferably and) buff hemo so that you aren't completely screwed.
I guess the other option would be to make sub so far ahead on the fights where mechanics don't screw it, that sub is a clear winner, but I don't see that happening as it would mean either sub is crapping on every single other dps class or assassination/combat are sub par compared to every other class which means rogues are sub par on fights where sub mechanics don't work well.