I like to think of Hatfields as having a kind of shabby charm to it, but you are right it is a bit desolate at night. Ive never had any problems but you do have to walk it wearing your "dont mess with me" face.
Have they finished preparing those new sports surfaces? Maybe when they become popular for evening sports the area will be livelier (Im assuming they are lit?).
Hatfields is fine, in my experience. Maybe don't go down there in the dark, if you feel uneasy - which you might say for many streets. it's all about perceptiions. Not being smug. It was a lot worse 200 years ago, if you watched Peter Ackroyd's marvelous series recently.