Looking at all the answers, I'm surprised that most people are saying no but they don't look bad actually. Nose studs look better but on the side. As long as it isn't a septum piercing or a hoop then it's fine.
Just remember, a lifetime is a LONG time. What seems so cool and hip today may not seem so in 20 years as you're trying to advance in a career. Most professionals would tell you that this is a bad idea. So unless you are gonna have a career as a DJ or Hip-Hop dancer, it probably is not a great idea.
I have a nosestud on the left side of my nose, and I love having just that one tiny piece of jewelry. I don't have any other piercings besides my ears. Nose studs can look nice because they're dainty and not too noticeable. However, they can be bothersome, for example, anything you do with your face becomes more difficult, like washing your face, wearing glasses, using a nose strip, etc. The piercing can be easy to come out with just a little rough action (woke up one morning with my nose stud completely gone and nowhere to be found) so you will need to adjust to being more careful with touching your face. If you decide that you don't like it, the gauge is usually at 18, so you can easily take it out and let it heal. But I think nosestuds are the perfect piercing to add to your face if you want something subtle. Hope that helps!
I don't really like them but I find that they can look good on certain people. Depends on your nose shape.. if it's like victoria justice's shape, then it might look nice. But it would't look nice on.. let's say, Selena Gomez's nose shape.