I think they're extremely lucky characters and unlucky characters in most cases, I mean they manage to avoid death in many occasions, they manage to stick together and get to Aspen and be adventurous. I would say that they are dim witted rather than stupid. They look dim and sound dim and do ridiculously silly things which we look upon as being funny, and they are funny. Not 'Ha Ha' Funny but naturally funny, reverting back to the classic comedies of the 1930's and 40's. Stuff like that which is naturally funny.
What amazes me the most about this film is that it actually has a plot! I know. Shock Horror. And not only that it's got a really compelling storyline which goes on and on and on. It's almost as if you can make it up as it goes along in the planning stages and write up a script and then that in turn equals the story. It's looks so unrehearsed and so improvised, and for a 90's film, pretty dated by todays standards but still effortlessly entertaining.