Pros
Former sailor of almost 9 years. Honestly, Its different from the cooperate world. Getting fired is nearly impossible. If you're married they will pay you extra and automatically give housing allowance. It's a great way to learn many different things that is not your job. All in all. In my personal experience, no matter what the situation was. It was a non-regrettable one at that. To serve was an honor. You don't do it to impress others. You do it to better yourself, hone your discipline and better your country.
Cons
Sea duty, you are always away from home, underway, or on deployments. So thats normal. also, you signed up to serve your country. Not get married at the age of 18 once you enter the service. Go do that somewhere else please.