It's ranked #50 according to US News in terms of research. As an applicant this year, I'm growing tired of worrying about the rankings though. Miami has a decent reputation that will only grow in the upcoming years as it serves such a large geographical area in the southeast and is continuing to expand its influence in research. It's certainly no wash U/harvard/cornell, but in terms of interesting research and career building, Miami seems like a great place. Best of luck!