I've personally logged quite a few hours on Mad Trix, and all things considered, the game isn't that bad. Keep in mind we're dealing with "version 1.0" software...remember how bad Coolboarders 1 was when it first came out? Obviously that was on a different platform, but you get the idea.
I'm confident that if 3DO gets the green light for any future releases, they will surely improve the rather stiff motion engine along with the graphics, sound, etc. Let's just be glad someone finally stepped up and produced a skiing game to counter the plethora of over-hyped snowboarding games already out there.