After skiing in over 20 resorts in North America from December 2017 until April 2018, I have to say that Thredbo stacks up well. It would be nice if it were steeper but in so many ways Thredbo offers a great skiing experience., especially for families.
Ticket prices are much cheaper than in the big resorts in North America, especially when taking the exchange rate into account. And Thredbo's snow making keeps the resort running when many in North America do not have the capacity to do so.
In Thredbo car parking is free and within walking distance of the lifts. In the USA many resorts have you paying to park and then you wait for a bus or gondola to get you to the lifts.
Thredbo's grooming is always excellent and the off-piste runs might often be short, but are rewarding. From my experience there are more rocks in the Rockies than at Thredbo, except the Canadian Rockies.
And yes, Thredbo does get good dry powder and good dry windblown. It was a surprise for me that you could spend a week in a big name resort in peak season and not get a powder day. And often the new snow there is sticky and heavy.
In North America we used Snow Forecast every day for our trip planning and found the data accurate and invaluable, as in Japan and at home. Thanks, Ted.