Leaf fan coming in peace. Please don't shoot! An Oiler's fan/friend of mine just wrote me asking for my opinion so figured I'd copy/paste my response here.
The Leaf's goalies save percentages were about 1 to 2% lower with Barrie on the ice then without him. (#'s similar to Martin Marincin if Oiler fans remember him) He was given the highest amount of offensive zone starts of any Leaf defenseman. His points/60 were pretty much the same as Muzzin, Rielly, Sandin, however... the top lines on the Leafs are so inadequate on defense, the Leafs couldn't afford another two-edge sword, so he was often running with the more defensively-orientated bottom six to cover his backside. If you have the right players to wrap around him, Barrie is an absolute steal. If you don't, you'll be wondering why you just lost 4-5.