I think the filibuster is a good idea for legislation, but not for confirming appointments. Also, I don't think stopping votes for or against confirmation of Presidential appointments is a "positive good." Leaving Cabinet Secretaries, Ambassadors, Judges, etc. vacant for long periods of time is not a good idea.
Well, there are two points you make. The second, with respect to vacancies, is a debate for another time. Your first, I agree with. I'm not sure that the "advise and consent" clause contemplated the shennanigans found now or, even, the process that is set up.