Time and technology have been very kind to Unleashed. I always found the Werehog levels pretty good anyway, but at 60 fps on the Series X|S, the smooth combat and platforming shine not as chores between day levels, but engaging levels in their own right. The day levels too hold up well; with no frame drops, they hold up as some of the most visually stunning and fun to speed run levels in the franchise. Rooftop Run and Dragon Road in particular are endlessly replayable. Even the fiendish difficulty of Eggmanland is a thrill. If you have the opportunity to play with boosted performance I implore you to give this another go.
The werehog battle music remains annoying though. I will give you that.