I too just caught up with Crashers last night. Good laugh quotient, and just enough of Walken being menacing to Vince Vaughan, but I deplored some of the ad-libbing during the dead air sequences. Either that, or the writers didn't know how to satirize the rich beyond making the sweet-looking granny rant about her "homo" grandson, etc. But I'd give it three stars.
Actually that part made me laugh very hard. I mean there is a sweet looking elderly grandma and she yells very UN-PC things. I thought that was HILARIOUS! Oh and that stuff about Eleanor Roosevelt being a lesbian was hilarious as well.