I personally detest both bright colored gear of any sort (visual pollution, per the Leave No Trace folks) and camo. Silnylon gray is my favorite color for gear. I prefer to be hidden rather than sticking out like a sore thumb. Per the 7th principle of Leave No Trace, being considerate of others:
Bright clothing and equipment, such as tents can be seen for long distances are discouraged. Especially in open natural areas, colors such as day-glow yellow are disturbing and contribute to a crowded feeling; choose earth-toned colors (ie. browns and greens) to lessen visual impact.
On the other hand, I'm a firm believer in reflective tent guylines, which make the tent visible a half mile away in the dark, using my headlamp.