Our competitiveness within the conference has not improved in that period.
Who has the best record in conference play since we joined the conference and how do we compare?
For the sake of this argument, I included the conference win-lose record for each team in the B1G for the last three years while Nebraska was a member. To Dr Strangelove's point, with a 5-3 record in 2011 and then again in 2013, you could say our competitiveness has not improved.
Still, as you can see, only Ohio St (+2) and Michigan St (+1) have better records in this three year time. Thus, an argument could easily be made that we have been very competitive in the B1G.
Leaders win-lose total (record for 2011, 2012, 2013)
Michigan St 18-6 (7-1, 3-5, 8-0)
Nebraska 17-7 (5-3, 7-1, 5-3)
Michigan 15-9 (6-2, 6-2, 3-5)
Iowa 11-13 (4-4, 2-6, 5-3)
Northwestern 9-15 (3-5, 5-3, 1-7)
Minnesota 8-16 (2-6, 2-6, 4-4)
Legends
Ohio St 19-5 (3-5, 8-0, 8-0)
Wisconsin 16-8 (6-2, 4-4, 6-2)
Penn St 16-8 (6-2, 6-2, 4-4)
Purdue 7-17 (4-4, 3-5, 0-8)
Indiana 5-19 (0-8, 2-6, 3-5)
Illinois 3-21 (2-6, 0-8, 1-7)