An almost precise parallel for Skyward Swords in comparing production values is either Kingdom Hearts 1 or 2. They're fundamentally structured in the same manner. Both forgo an overarching overworld or hub-world in favor, instead, of what is fundamentally a level select system. Additionally, both are adventure games predicated on sword battles and some light puzzle-solving. Finally, both vacillate between and weave serious and light-hearted, oddball story elements and characters virtually seamlessly.
Kingdom Hearts had orchestrally composed music and full-fledged cinematic cutscenes, replete with wondrous voice-acting, in 2002 on inferior hardware. The voice acting can only be seen as a boon to the experience.