The reason Benitez is labeled a bad closer isnt because of his stats. Its because he had a history of blowing saves in crucial situations - something that doesnt really express itself in the final tallies. He's a good closer, but I can think of about 15 other closers Id rate ahead of him in important situations.
And finally, you guys can use the addition by subtration theory all you want - good luck with that. We just got a 28-29 yo 100+mph flamethrower with control issues for a 25yo prospect who hits the low 90s on his fastball and has control issues and was never projected to be anything more than a setup man - one day - possibly.
But, somehow the Cubs got the better deal?