No there is nothing wrong with brass countertops in your kitchen. It just depends on what you consider to be "wrong"? I own a company that makes brass countertops and the first thing I do is to educate prospective customers on what to expect. Brass, like copper and zinc, reacts to its environment. Therefore, water, tomato sauce, lemons and other acids that you will find in the kitchen will react with the brass. You need to keep in mind that there is a difference between polished and clean. You can clean the surface, but it might still show spots.
The "right" thing about brass is that it has a high concentration of copper in it and copper has been proven by EPA as being anti-microbial. Brass has some of these effects as well. Therefore, brass is a better choice than some other materials such as concrete or marble.
As with most metal surfaces, we don't recommend regular food preparation directly on them.

I wouldn't recommend brass as a countertop material because it can reacts with its environment and requires a lot of care. There are many other better choices, such as quartz, stone, recycled glass, stainless steel and even recycled paper.

Learn more about different types of kitchen countertop at the website,

Source: http://www.premier-kitchen-design.com/kitchen-counter-tops.html

No - I don't believe there is anything wrong with it- as long as you like it! :)