Cutscenes add so much into video games, without them you would (almost) never know what happens outside of your playing field. Examples: What the villain is up to, other major important characters are doing, outside forces beginning meddling in the story, etc. Though there are ways to tell a story without having cutscenes. Such as reading newspapers, books, an NPC telling you some bits of info, or the antagonist broadcasting from large monitors like Half-Life 2 did, but that only works in some games. Anyway, Project Ukulele definitely needs a great opening and closing cutscene, like Banjo-Kazooie/Tooie had. With lots in between cutscenes of course too.
Shame that Banjo-Tooie never had more cutscenes involving the Big-O-Blaster draining the life-force out of the Isle o' Hags dry, reducing everything into a zombie wasteland. It's possible that time constraints were the reason why there aren't more included in the game, and a for that matter.