I agree with you, I do not doubt at all she had a good voice, but Beyonce or Mariah Carey also have good voices and for me their songs are something that must be played at the gates of hell.
The Carpenters music is simply excruciatingly corny.
I'm a rocker and an indie chick mostly but like Abba the Carpenters are classic even if they are mostly not the type of music you listen to - I used to live with a Machinehead fan and I have happy memories of us dancing joyfully to her Abba Gold CD together. You should never dismiss an entire genre of music - there gold and rubbish in all of them.
That said if Celene Dion is playing when in the afterlife then I'll know I seriously messed badly somehow.