Yours truly, writing at MacStories:
iLife was brilliant because it was approachable. Programs like iTunes, iPhoto, iMovie, iDVD, and GarageBand were so simple that anyone could just open them from the Dock and get started creating.
Of course, not everyone’s needs were met by the iLife applications. iMovie users could upgrade to Final Cut, while Logic was there waiting for GarageBand users. And for those needing more than what iPhoto could provide, Apple offered Aperture.