Do not trust the reports! Some days the report told us that there wouldn't be any snow at all, and some of those days were the deepest. Find some site that reports on how it actually is. http://www.snowjapan.com/japan-daily-snow-weather-reports/Niseko-Now is a good one, they report about storms coming in. Actually sounds like there have been a dry period now. I spent 18 days from new years and had soooo much snow. Definitly going back, same period next year. Didn't see much of the sun.
It is however pretty flat, but if you know were to ski you'll find good terrain. Not like the rockies but descent terrain. You go to japan to ski deep powder! Hakuba has steeper terrain but it isn't rare that they get rain and warm temperatures (from what I've heard). And with steeper terrain comes higher avalanche risk and more closed areas.