Boundary road and all the shops that reside on it are horrific. Sorry for completely overseeing that one, however it's an experience firmly put to the back of my mind.
Blatchington Road is hideous....however, George Street redeems it, as George St is getting very good. Especially where independent shops are concerned.
My vote is for the New England Quarter Sainsburys. Only my second time in there, but oh my what a depressing place to shop. Service with a smile is well and truly not the message in there.