The bullpen had the 9th best xFIP in baseball (6th best in the AL), and 12th best SIERA (7th best in the AL) after the acquisition of Richards & Cimber. They really helped solidify things down the stretch. The bullpen also wasn't as bad as you'd think. They just happened to always give up runs in high-leverage situations, which made them seem worse than they were. There was certainly some bad luck there. I wouldn't say it's a great bullpen, but certainly above average, and even could be good if managed properly by Montoyo (which he got better at as the season went on).
Overall:
Romano (great)
Mayza (good, could be great if he takes a step forward)
Garcia (good)
Cimber (good)
Richards (good)
Merryweather (great, when healthy)
Phelps (good, when healthy)
Saucedo (fine, when used in the right situations)
Stripling (good for a long reliever)
Thornton (meh. Fine for mop up duty)
Not many "bad" relievers there, but we'll have to see how it pans out. Bullpens are volatile year-to-year, and it'll probably look different by end of April anyways. Improved defense with Chapman at 3B will help. SP's giving good outings will help. Montoyo not being a total numbskull with some of his decision-making (hopefully) will help.