Just to add to this SuBo debate, seeing as i mentioned her cover originally. The cover itself, i think, is very good. The composition isnt the most original creation going, as nemo says, but the tempo change works well, as does the piano, and Susan has a very nice, "pure" tonal quality to her voice. No, she's not the greatest singer with a huge range and power, but she's very good with what she has!
Would i buy her record? No. But i wouldnt change station if her song came on the radio either. The Leona Lewis Oasis cover is suprisingly good, although again, the composition follows a pretty common structure.