Just to make the comparisons more useful:
Kelly/Thankful - 2.4 million in about 36 months
Clay/Measure Of A Man - 2.7 million in 27 months
Ruben/Soulful - 1.7 million in 25 months
Fantasia/Free Yourself - 1.8 million in about 16 months (?)
Carrie/Some Hearts - 2.1 million in about 4 months
Kelly/ Breakaway - over 4.5 million in about 12 mo. (I don't remember when it came out but it was over 1 year ago.)
No I wouldn't say Ruben and Fantasia have "flopped."