He is a the famous curmudgeon of the bible - by which I mean, he is a Doctor of the Church, and famous for his translation of the bible from the original Greek into the vernacular of the day: latin. He was a noted scholar with a keen mind and a sharp tongue as well as gifted in languages.
And that's the thing that I tend to take away from St. Jerome. Not only is he the patron saint of librarians, students, school-kids, translators (and hey, I should be hitting him up for prayers daily, what have I been thinking?), archivists and so on. I think he just might be the ticket, the patron and go to prayer guy for grouchy critical folks like me! He shows us (ok, me) that even us grumps can get to heaven and God can work even through the grouchiness and beyond. It gives me hope, I tell ya!