I'm considering joining an engineering department as a graduate student at a US university which has been rapidly expanding over the last few years. They don't have a lot of name recognition at this point but have a few other things going for them. They are ideally located and have excellent labs and collaborations. Over the last 6-7 years the department has jumped up ~50 spots in rankings and the college of engineering has gone from ~50 - 150+ faculty. Since most of the PhD candidates who joined after this expansion started are still in school, there is very little record to show which careers PhD graduates go into and how they do over a time of few years.
What could be the potential downsides of joining such a department?