The dilemma for the filmmakers, the Stones, and the viewer is that to some extent we all want to hear the old songs—but the Stones probably don't want to be seen as an oldies band. There are a number of newer songs and covers in the first two hours of the movie and, while they're quite good, they're not the classics. An interesting sideline, to me at least, was that other than myself, everyone in the theater had white hair.
Here's a true confession—I often leave movies, even movies that I'm somewhat interested in, halfway through. The Ruins was more interesting than I though it was going to be, but my heart and soul—and nervous system—just weren't ready for the horrors I knew were coming, so I left.
I will undoubtedly go back, and watch the second half, presuming that the theater will allow me to buy a ticket for the second half, which sometimes is actually difficult.