TV in living room: do you think it is tacky?

I have a living room that is only about 15' X 12' and has little room left after the grand piano, a sofa, chair and coffee table. I have always been taught that a TV looks tacky in a LR. I would like to be able to hide it in an armoire, but there is not room for one. The only place to put it where it would be easy to watch would be a flat screen on the wall over the fireplace. Would like your opinion on that, or should I just have one in the bedroom only?