Hagel is a dangerously-unready loon, unfortunately they aren't opposing him for that, the filibuster is due to the Administration refusing to provide requested responses to questions and trying to stonewall their way through the awkward questions about Benghazi. If they ultimately come to their senses and provide it, the answers won't reflect on Hagel one way or the other, just Jughead, Hitlery, Panetta, and Brennan (Of course the first is the only one that matters to them) and so Hagel will probably end up getting a straight-up vote and win on party lines...of course there is an equal chance that the Administration will still try to stonewall the requests and expect all the rhetoric to cow the Republicans into submission, because they refuse to do anything that shows Jughead to be the incompetent uncaring boob that he is, in which case I don't think the Republicans will roll over and the filibuster will stand.
I have a pretty low opinion of Brennan myself, based on some interviews I've seen him give. He comes across to me as someone who is not nearly as intelligent as the press is portraying him (Even Fox, which does not like to say negative things about people charged with national security responsibilities issues generally, until after they screw the pooch so bad that nobody is being fooled anymore). He strikes me as an authoritarian bureaucratic little shit of a politician who ended up working in the CIA instead of at a paper products distributorship.
