Ok, it's actually pretty simple... each new form has a new move, as follows:
Fan - Air Slash
Fridge - Blizzard
Oven - Overheat
Lawnmower - Leaf Storm
Washing Machine - Hydro Pump
They all have the same classic typing (Electric/Ghost) and Base Stats (50/65/107/105/107/86), which are quite defensive, and coupled with those awesome resists, makes the best anti-spinner in the game.
Since it lacks any form of recovery other than switching from Leech Seed Shaymin (irony), people have been using Rest/Sleep Talk variations which normally carry Discharge or Will-o-Wisp for support. However, many are using Trick sets with Scarves, mostly on the form of Oven Rotom, the best one when it comes to coverage.
While the UU had a Base Total of 440, the new forms have 520, making them superior in many ways, lacking in only Speed compared to the original. That pretty much wraps it up.