One of the important funny men of the 70s-90s gets his own documentary from his friend Rob Reiner.
If you're not familiar with the stand-up by Albert Brooks, which I was not, you should know some of his movies - Modern Romance (1981), Lost in America (1985), Mother (1996), etc. And if you're not familiar with his movies, then perhaps with his performances - Broadcast News (1987), Finding Nemo (2003), Drive (2011), etc. And if you're still not familiar with him, geeze, I don't know how you've gone through life without seeing at least of these movies.
I've always held Brooks in my mind as a toned-down Woody Allen kind of figure, presumably because he did share some of the stylings in the movies that he wrote-directed-featured-in. He has worked on so many good films, regardless of his part in it, that it's hard to ignore him as an important artist of his era. Proof to that is the quantity and quality of talking heads who took part in retelling his story, from Stephen Spielberg to Ben Stiller to David Letterman (and many more). You get a good sense of the kind of guy Albert Brooks is and a taste of some of his memorable works, but a lot of the focus is on his irreverence as a stand-up comedian - which is probably where the value is in this, because the movies will always stand on their own.
Other than that, the documentary is traditional to a t, going over the career of AB while adding some context via a one on one interview between him and Rob Reiner. There's a fair amount of funny stuff in it, if not riveting, and a warm portrait of a guy who has left his own distinctive mark in "the business".