Agree with ASV. High ceilings are almost always a plus.

It depends on the room i think. If a bedroom I love the pic above with the trim dropped down the wall to make it feel a little cozier. In a LR you then have the chace to play with some interesting lighting that wouldn't work in a 8' ceiling and it gives small spaces more volume.

9 0r 10 feet would be sufficient for bedrooms.

Is it sloped or flat?

Height is a plus, but I agree that a cube is unsatisfying. There are many ways to add depth and visual interest, e.g. a lowered border-ceiling with recessed lights and an LED string embedded to wash the central, higher ceiling. Depending on the design sought, that centre could be embellished with an aluminum (silver) leaf, copper or gold. Alternatively, it could be a shade lighter (or darker) than the ceiling border, or a trompe l’œil work of art.

Height = opportunity!