Let's start by not mincing words.
Band Aid 20 is a truly awful song.
The thinking behind it, of course, is fantastic, and I hope it raises a huge amount of money for a worthwhile cause. But the original Band Aid single was not only doing this for a worthwhile cause, it was a decent song.
This time, you can almost feel that when Bono does his "Well tonight thank God it's them instead of you" he really can't be bothered with it. The vocals are blandly sung, the music is bland and there's none of the continuously building crescendo of the original song.
This single will sell, largely to the kids of today who like the singers on it, and who weren't around in the mid 1980's when the original came out. But I feel that this could have been so much more.