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First up, I'm not going to review their albums. Madge's Hard Candy and Mimi's E=MC² have gotten far more thought-out write-ups than anything I'd ever have the patience to come up with. I don't form a true opinion of a record until way after the fact, anyway.
Two of my favorite albums of all time are R.E.M.'s Monster and Madonna's Bedtime Stories, which I played over and over and still like to listen to -- but which are derided by hardcore fans. So what the hell do I know? Plus, album reviews are so subjective, and so, ultimately, what the hell does anyone know?
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There are songs I like from each of these albums (Mariah's "For The Record" and, yes, "Touch My Body," and Madge's "Dance 2Night," which is killer old-school) and songs which completely chew (Madge: "Spanish Lessons," Mariah: whatever that one about the last kiss is called). At the end of the day it's just pop music, though, and we'll tire of some songs we thought we loved, and learn to appreciate others more.
Or, in the end, maybe we'll just file them away and sigh, Well, there's always the next album.
FINAL NOTE: Slate did a great write-up on Mariah today called "Bigger Than Elvis: Why The Haters Are Wrong About Mariah Carey."