Mostly good. Dumb ending.
I was obsessed with Zucker/Abrahams/Zucker films as a kid. Watching them again, years later, there are a few very, very good jokes, hidden among thousands of rapid-fire dumb gags. It's the "throw mud at a wall" approach to comedy.
It's fine and nice and enjoyable but I really don't get all the hype. I wouldn't call it the best Sidney Lumet movie. I wouldn't even call it the best Ed Begley Sr. movie.
The whole thing is a set up for sequels. It was way ahead of its time, as it predicted our current modern flood of failed/boring franchises planned out long before the first movie starts filming.
It's a pretty good movie, in spite of the fact that it can be edited down to two minutes and thirty seconds without losing any of the plot or characterization.