I'd say Jordin is midway, but leaning more towards a singles artist. But she still isn't as unlucky as Natasha and Sean Kingston. I think Natasha's main problem was that she released her album when airplay for Love Like This was decreasing in one of the worst sales months of the year, and didn't get good airplay for Pocketful of Sunshine until the album had already fallen down the chart. and Rafael, Sean Kingston is not 1-hit-wonder, he's already had 3 top 20 hits
unless you mean album-wise