Of course, inherited runners stranded doesn't tell the whole tale of relievers, short or long. Many times nowadays, when starters work so few innings, relievers are coming in a lot of the time with no one on base to strand or score. For example, closers often come in at the start of the ninth with no one on base. That needs to be factored in as well, to give a more complete picture.
So how would you rank relievers, all around, in each league this year so far? I know here in St. Louis Jason Isringhausen has been very impressive. Over the long haul of many years, I would say Troy Percival of Anaheim and Trevor Hoffman of San Diego are the guys in each league who are still at the top of their craft and also have had the most consistent excellent careers.