The Pittsburgh Pirates have the third best record in the major leagues behind the St. Louis Cardinals and the Kansas City Royals. That also puts them second best in the National League.
The Pirates are 16th in runs scored, 24th in walk percentage and 14th in on base percentage. It is fairly safe to say the Pirates offense is right around average over all.
The Pirates are 3rd in innings pitched, first in Ground ball percentage and second in ERA. It is fairly safe to say the Pirates have one of the best pitching staffs in Major League baseball.
The Pirates rank 26th in the MLB in total defense according to Fan graphs while giving up more runs due to error than anyone except for Oakland.
Of the Pirates semi-regulars only a handful have a positive UZR. Those players are Marte, Polanco, and Mercer. Kang has a positive UZR at third base and Rodriguez does at first. For comparison, every regular on the Cardinals has a positive UZR except Peralta.
So the Pirates over all have a fairly average offense, a great pitching staff and miserable defense.
What does this mean really? Stats are just that stats, they tell you what has happened in the past to give you an idea of what may happen in the future. They are numbers on paper that do not determine how a player plays and do not tell the whole story but they can almost always give you a general idea what to look for.
At the trade deadline the Pirates had the right idea. Pick up people to cover for injuries, plug a hole in the bull pen before it gets overly exposed and put a band-aid on the biggest hole on the defense.