I just drove around 20 miles in the county roads after an overnight 20 inch snow. Was comfortable all over the drive. In my last 3 winters with CRV, never it lost control in snow.
I can only asume that this person is much more gentle with their driving habits than I am (and I'm no Evil Kenevil). However, in my experience (with AT tires) there is some slipping with the AWD system Honda uses. In fact, that is how it is designed to work. As one tire looses traction, the others engage.
I have had my 2006 AWD CR-V EX (M/T) since March 2007 and have lost traction numerous times. We are not talking about dangerous situations, where I'm in sliding off a mountain, but it can get a little slick when going around turns and up hills, which is where the AWD system kicks in most often.
The CR-v is not a Jeep or a Hummer, so in my opinion, you will not be able to go through 20" of snow at all (let alone easily). The ground clearence alone would prevent this, though you may be able to puch some powder out of the way with your front bumber, the undercarriage of your CRV will not likely stand up to this type of off-road test.
These are my opinions ad not meant to offend anyone, but with my experience with the CR-V you are looking at having the ability to get around during a snow storm, but not have the tires, ground clearence or power to be a snow cat (aka: nothing stands in my way (snow or ice) no matter how deep)
Then again, you ask somewhat relative questions. Are you asking how the CRV would do in Texas with a light dusting, or in a Colorado (mountain town) winter?
* A side note on life: People are not generally let down because of product features/failures. They are most commonly let down because of unrealistic expectations. Having accurate expectations goes a long way in uderstanding what is and is not possible.