Adele just about deomonstrates more capability than Katie Melua, for example for changing pace. Whilst "19" is a good first release with some good vocals and material for me it does like a high impact song.
The best performances are the the ballads with the simplest musical backing on this album. On a couple of tracks I did note a hint of a Lily Allen accent coming through, but without the humour, especially on "Tired".
For my "1921" playlist I've selected, "Daydreamer", "Chasing Pavements", "Crazy For You", "Right As Rain" and "Make You Feel My Love".