I thought this was going to be a comedy thread, not a flame war thread!
I have the 172 MB5 and demoed the 162 for a day last season. The B5 is a really nice carving ski and also works better than most other carving skis in a variety of conditions. It skis groomers like a top of the line carving ski and skis off piste with the versatility of a 70-30 model. Very stiff, heavy, and sufficiently damp, full of energy, has a minimum speed limit which depends on your weight and strength. The 172 is more stable at higher speeds and is I think more versatile than the 162 which is too short to be a true one ski quiver for an aggressive adult sized person who skis the whole mountain--although both do ski very long for their sizes. If you want a quiver ski for days with not a lot of new snow, the 162 is the better carver. If you want one ski for anything I would take the 172. The strength of either ski is carving so if you already have a serviceable carving ski you should get something else.
Ratings for the 172
Carving is where it belongs medium-short turns (9/10).
Medium-long turns (8/10).
In bumps its predictable, but not forgiving, a so so bump ski. Requires a finesse bump technique (3/10).
In Pow its tip float is good because it so huge. But it requires a bit of finesse and isn't as predictable as you might want in the pow. Not for aggressive pow skiing (maybe 4/10).
In crud, soft slop, corn, and other variable conditions its damp, stiff and can bash through most stuff. Feels stable in variable conditions (5/10).