is ok, not great, but ok. She plays like Diana, just with sustain from spell vamp instead of a shield.
good clear (all magic damage), good sustain, ok ganks (pretty good after 6) and excellent team fighting.
Plays as a carry jungler, decent clear and sustain, great gold gaining, maintains global presence with "ult ganks", poor actual ganks though.
Haven't seen it done well in person, but it can work. Great AoE clear, with a fighter build you are just about as good as most other junglers. You have great burst damage ganks, but need a CC heavy team to really shine. Only average sustain though (which is a big issue in the current jungle).
Amazing sustain, decent clear speed, ok ganks, decent team fighting, overall just a bit mana hungry.
good sustain, ok clear speed, decent ganks that become flat out fantastic after 6.
great sustain, great clear speed, meh ganks. He is a very good jungler when you want to simply be jungling and beat up your opponent, but he is a weak ganker and is pretty mana hungry.