It is the tires. The Odyssey, and pretty much every nose heavy front wheel drive vehicle, will do just fine in snow with proper tires on it. Subaru has done a brilliant marketing strategy in making people think they need the AWD, plus all the plastic cladding they glue onto their cars. Reality is they don't. It's been tested over and over by numerous car magazines, tire companies, etc... Even a RWD car with good snow tires will do quite well on your normal snow covered road. Yes, if you literally live on the side of a mountain and have to climb a steep grade covered in thick snow and ice, you'll want a full time 4WD and probably still want snow tires. But if you're driving on normal suburban roads and highways, you don't.