Using brick sure does look nice, it gives more texture than plain concrete. There are, however, a few downsides. Take, for example, this picture of Bethesda Metro Plaza. You can see that the bricks aren't totally even, you can also see that they are sightly lower than the drain (in the middle of the picture). Probably they have settled unevenly a bit after being laid. Not even noticeable when it is dry, but when it rains it makes the whole area one big puddle.
[where: Bethesda, MD]
[where: Montgomery County, MD]