Heroic dummy
4.24% tooltip hit (not being hit capped hurts /click dps immensely), 21/5.25% exp
No Berserk, completely unbuffed

Shred/"manual": 7100 dps (this is 12-13k saurfang/fester/rot, for raid buff reference)
/click+mangle glyph: 6100 dps (~85% "efficiency")

Its no where near the efficiency you can get as an ele or ret but its not nearly as terrible as I was expecting.