Clint Eastwood is one of the few filmmakers whose work I always attend on his reputation alone. This is not to say they've been classics (think of his orangutan movies) but when entering a theater I can be reasonably confident, worst case scenario, of seeing something above average.
Eastwood has had several defined periods, such as his Spaghetti Westerns of the 1960s and the cop pictures of the 70s and 80s (which arrived a bit late here in Mexico because "Dirty Harry" was censored). In a career that spans five decades and included dozens of features, a single splits it into Pre and Post, and that film is "Unforgiven." It's hard to think of a single feature that puts into perspective a filmmaker's career like this one does for Eastwood, and it opens the door to his current stage which has included some of his best work.