There is a more current Tony Crocker early season article here (that one linked above is from 1995, and the rankings have changed):
We go to Whistler every year for a long Thanksgiving weekend (Wed-Sun) and I'm always happy with conditions. We haven't even had to download the past few years--there was snow coverage to the bottom. There are great deals during that time, since it's early season--we always get a great condo deal (in fact I booked a 2 bd, 2 story, dog friendly, private hot tub condo for $150/night just today!), and lift tickets cost less. It's not crowded. The past few years Whistler Mt has opened early/mid November, then Blackcomb always opens (US) Thanksgiving day. But, the entirety of both mountains aren't open, of course. The high alpine won't be. You'll be skiing groomers, probably. But, compared to anything else early season, the amount of terrain that's open is great. It's totally worth it, for us, since we can drive there. It's something we really look forward to and are always happy with. That all said....If I had to put a whole family on a plane from the East Coast to get there....ehhh...I don't know. If money is no issue, why not. If it's your only trip of the year? Probably not.
You can find snowfall stats on Whistler by month linked below. You can see that the last three Novembers have been amazing, and even in the bad years, it's still a lot better than most other places. But I wouldn't have wanted to fly cross country during the bad years.
Here's what the above article says about Whistler.
3. WHISTLER/BLACKCOMB, British Columbia
One can easily underestimate Whistler's early-season reliability by focusing upon the rain-vulnerable lower mountain. A poor start to Whistler just means that the lower 1,000-2,000 feet aren't covered so you must download at the end of the day. The Whistler and Blackcomb Alpine regions got about 100 inches of snow in November/December of 1997, 2000 and 2005 (the average is more like 150), and 5,000-plus acres of terrain were open by New Year's . There have been only three early seasons in the past 28 years (77 inches in 1989-90, 91 inches in 1992-93 and 81 inches in 2004-05) with less snow. Whistler's early December World Cup downhills were cancelled three years in a row due to too much snow. In the 2000-01 Canadian drought, Whistler had the only quality skiing in a 500-mile radius from mid December to late January.