It has its moments for sure, but it's never had me rolling around. I'm not a massive Python fan tbh, although I appreciated people have been stoned to death for saying less.
You're right, I totally agree it IS a dreadful film. But I think you'd be hard-pushed to find anyone who rated it, so it doesn't really belong on this thread chap.
Another one I struggle to understand all the fuss over is The Deer Hunter. It begins with the most interminable neverending wedding...
That wasn't overrated, it got absolutely PANNED (16% on Rotten Tomatoes).
I've tried to like Spinal Tap,and it has its moments, but its nowhere near as funny as so many people seem to make out. Likewise Life of Brian.