they are nice, but it's the same reason i don't like dutch-style aquascapes - too many colors and too much "noise".
i love a planted freshwater tank with a natural looking substrate, painted background, and 2-4 types of plants to make things look unified.
that's just me, of course.
i probably won't own a saltwater tank for many many years.
i think i'm just going to line my tank with a bunch of jungle val and let it grow.