1. You have no need to speak of aggro, Growl auto taunts mobs to itself and you have Misdirection with the glyph(no CD) against AoE packs
2. BM is slower for leveling because SV can AoE pull at a much better efficiency than BM
3. Exhiliration sucks, you shouldn't even be close to dying while leveling, if you are, you are playing wrong. Spirit Bond is the best for leveling by far, passive self heal is the best.
4. Killing Rares was so easy as SV even, I was laughing because against most rares, Spirit Bond heal was enough to keep my pet up.