Well, once upon a time there were starters, late inning relievers and middle relievers. The middle relievers were the guys who weren't very good and were always coming and going on a shuttle.
Now middle relievers have to be good too.
I go on the NYY Fans site quite a bit to read what they're saying about Cashman. I can't help myself. They crucify him on a daily basis and some of the comments are hilarious. It's great stuff.