George Harrison was the first of The Beatles to release a solo album but was probably the least interested in actually having a solo career. Only John Lennon toured less, and not by much. When Harrison's multi-platinum Cloud 9 was released in 1987, he was asked if he'd be out touring the record, to which he replied, "I hope not."
His former mates in the Traveling Wilburys have mostly confirmed George missed the idea of being in a band. While internal tensions and competition for precious space on the albums strongly fed his disenchantment with The Beatles, Harrison never really coveted being the center of attention nor soured on sharing the workload with others. As a result of Harrison's seeming indifference to his own solo career, there were often long gaps between albums.
When Paul McCartney was inducted into the Rock and Roll Hall of Fame as a solo artist in 1999, his daughter, Stella, wore a t-shirt that read "About Fucking Time." Harrison was inducted into the Rock and Roll Hall of Fame as a solo artist in 2003, also "about fucking time." The same can be said for the release of Let it Roll: Songs By George Harrison. We finally have a true career-spanning collection of Harrison's solo career.
When considering a compilation, one has to keep in mind these are rarely aimed at an artist's most devoted fans. The faithful will likely have all or at least most of the songs likely to be included on such a package. To suck the faithful in, labels will often make the dubious decision to place one or two previously unreleased tracks on the compilation, forcing the faithful to fork out money for a bunch of songs they already have in order to get the new. Let it Roll does not contain anything previously unavailable, although two rarer tracks from Harrison's solo career give this package some value even to committed fans.