I can't stand modern dude movies if you mean movies like The Hangover, Dude, Where's My Car, Et Al.
I just can't stand the stupidity. It's so sad that funny went from Abbott and Costello to pseudo-porn, drugs, and Über-stupidity.
I miss things being funny without having to use ultra shock and gross-outs to achieve a laugh.
I guess I would have to say that the best dude movie is Duck Soup. They weren't called dudes, but they were some of the originals. Without them we wouldn't have the sad imitations of today.