Tremblant has really nice terrain and a great village. As for it being crowded, I've been to
Tremblant twice (both times for a few days) and have never noticed it to be any more
crowded than any other reasonably popular ski resort. As long as you visit during the week,
and not a week that's a major holiday, you shouldn't have any problems with crowds.
The real problems with Tremblant are snow (the whole east got very little snow last winter),
the cold (the south face is totally exposed making the windchill factor sometimes quite nasty)
and by far the worst, price. For some reason almost everything at Tremblant costs within
5-10% of Whistler - when the two places don't compare.
Personally I prefer MSA over Tremblant. Le Massif.... ugh, unless someone's invested a ton
$$$ into that place since about '99/'00 to fix its many problems, I'd highly recommend that
people avoid that s@#&hole. Imagine a place where you can only get to the base of the
mountain by skiing through a mogul run and you'll begin to get the idea. If you're hardcore,
ski "Le 42" and then make a b-line back to MSA. In Quebec, I'd definitely place Stoneham,
Mount Saint-Sauveur/Mont Avila and several places in the Eastern Townships ahead of Massif.