re: Is "The Hangover" the funniest movie in the last twenty years?

I laughed quite a bit the first time I saw The Hangover, but on repeat viewings, it was a drag. It felt like a handful of funny scenes strung together with awful & uninspired improvisational dialogue. Nothing wrong with doing improv when it works (I bet alot of 40 Year Old Virgin was done on the spot, and it was awesome), but The Hangover was stuffed with filler...