What I think makes a good ski movie:
Good Introduction: This grabs the attention of the viewer, and immediately sets in there mind that 'hey, this movies looks awesome'.
Good music: The music has to fit the part. If you are filming a park scene or a urban scene, play some hip hop or rock.  Big mountain scenes need the flow of classic rock or experimental music.
Good Riders: Obviously, the movie must showcase some good skiing.  Have a variety of riders also so there is a mix in styles of skiing.
Good Filming: The reason that I put Matchstick on the top of the ski movie producers list is due to the fact that they have some insane filming.  Get different angles and views.  Make sure there isn't a bunch of crap going on in the shot, just the skier and the jump or the skier and the line.  Try to get other people in the background out of the shot.
Artistic:  For various reasons, skiing is considered an art form.  Why not accompany the filming with other types of artsy ideas.  The movie 'Wicked' was an amazing video filled with artistic approaches.
Editing: Make sure you take the time to edit.  Editing should not take onl;y a few hours, it should take a few weeks.  Make sure the sequence of shots flow, and aren't in a repetitive array.
Shot Order: As a rule of thumb, save the best for last.  If you are showing a segment of a particular rider, such as Tanner Hall, make sure that each shot sequence goes from smallest to largest.  So, for example, say you were filming Tanner at Chad's Gap.  Show a progression.  Start off small with him doing say a 720 over Chad's.(I know, nothing over Chad's is small, but you get the point) Then show him progressing, with the biggest trick last.
Avoid Cheezy Editing:  Don't put in stupid shit, period.
Thats my list for things that make a ski movie great.  We did an analysis in my tv productions class, and thats the jist of our findings.  Use them if you want.