disagree, nova and homing nova actually quite good for clearing if you can build 50-60 or more pierce. the regular bow skills like cascade/spore shot felt a little weak, especially early on, and in order to clear efficiently as you progress into uber levels, you'll need to quickly stack some damage and/or procs. Later on, they regulate out, but start off fairly slow, whereas the nova skills, espeially homing nova are really strong for bosses and general clearing. Just can't leech.