Pros: Friendly resort, excellent service.
Cons: Limited terrain, sometimes lacks snow.
Mount Selwyn is very enjoyable for families and beginners. Even very young children can learn a lot about the snow. Other Australian resorts could take lessons from their friendly staff and facilities for visitors. You don't feel that you are only there to make money for the operators.
As others have mentioned, downhill runs for intermediates and better are very limited, especially in a poor season.
Take the kids, relax and enjoy.