Not exactly a great start for Baltimore to free agency, but when I actually looked at the roster I felt much better. I mean Baltimore currently has under contract these defensive players, which should still be a pretty solid defensive unit and they still aren't done in free agency.
DL - Ngata, Canty, Cody, McPhee
LB - Suggs, McClain, Upshaw, Ayanbadejo, McClellan
DB - Webb, Smith, Graham, Ihedigbo, Brown
Plus a bunch of young guys who on a team like Baltimore probably means at least 1 or 2 can play and that doesn't include their still as of yet un-signed free agents of Reed, Williams, Jones, Kemoeatu.
Clearly they could use another LB and safety, but they should still be a pretty solid defense without much else. They also need a center and tackle on the OL, but the rest of the offense should be fine as long as they keep Jones, Pitta, and Dickson.