But, would anyone have predicted that would be the case? Probably not, which is why bullpen construction is a daunting task for pretty much every GM. Save a few guys, you can't count on year in year out consistently good performance....and they pretty much all want to close, so you are probably only signing one of those guys.
The best way to build an effective BP is from within, as you will control a good relief pitcher for his first 6 years, so he can't sign with some team offering him the closer's role. After that, you are left rolling the dice with the guys who have a lot of variance from year to year.
Some of the better bullpens over the last few years (Giants in 2010, Tampa in 2008, Philly in 2008) featured some reclamation projects that performed very well to make them so good. We get it that you don't like it, but you not liking it does not invalidate it as an approach that, while certainly not guaranteed (nothing is, not even signing "proven" guys - who regularly tank), is one that can work.