Mel Gibson's Maverick is somewhat goofy but charming, sly, and fairly humorous.
A number of excellent cameos provide some comic relief, especially Danny Glover near the beginning of the movie. The biggest surprise for me was Jodie Foster, who, in an impressively rare comedic role, thankfully discards her repetoire of facial tics for a much more natural performance here.
The plot is kept pretty simple until near the end -- and the end has a great twist, which I won't divulge. Suffice it to say that your time will be well spent.
Recommended rental for sure, but also consider buying this excellent DVD because this comedy does well with repeat viewing.