You have to remember that Adele is a singer songwriter. Don't think MsBassey or Elvis sang many of their own compositions. She was amazing and I wil be buying 25.
As for Adele, I do like her, I just find that radio and music stations like her too much and before a song of hers has even charted I'm sick to death of it already.
She is like Paloma Faith Amy Winehouse and many contemporary singers - there songs are sometimes very good but singing live is another matter, they rely too much these days on the recording studio fixing their voices.