Not sure about overrated.
But IMO she has quite a few underrated songs from a couple of Kylie eras.
I will ALWAYS rate her Deconstruction phase. God, some of the songs she was releasing during the mid to late 90s were bloody fantastic. Put Yourself In My Place, Where The Wild Roses Grow, Breathe, Some Kind of Bliss (the latter is amazing!!).
For some reason I find that most of her Body Language material as well as the previously unreleased tracks on her Ultimate Kyle CD (2004) don't get as much praise as they should. Aside from Slow, Red Blooded Woman and Chocolate were excellent. And from the compilation, I Believe In You and Giving You Up are proper tunes!