though I suppose Amerykah Pt. 2 hit for me at an age when her first two hit for most of you.
to me, Amerykah Pt. 1 was her opus, and Pt. 2 is her most fun album. for me and a lot of people EYE know, her first two albums are a reminder that more than D'Angelo and The Roots had that kind of sound.
I'd go
Pt. 1 Mama's Gun Pt. 2 Baduizm Worldwide Underground Phone
but that's me. and her "Hello" cover and "Phone Down" rank among my favorite Badu cuts so I wouldn't agree that she ever fell off or became less interesting.